MODULE MANUAL

Fifth Version, second printing, 2007 Revised

New Wiring Info

NTRAK Manual Specifications

INTRODUCTION TO NTRAK 2

INDEX Page

Module Layout Ideas 3Basic Module 4Optional Features 5Construction Details 6Leg Details 7Electrical 8-10Powerpole Connectors 11-13120 V AC Wiring 14-15Recent Changes 15Corner Modules 16-17Module Ideas 18Lighter Weight Frame 19Junction Modules 20oNe TRAK Modules 21Specifications 22Materials list 23Layout Checklists 24

In 1973 a group of enthusiastic modelrailroaders got together at an N scalemeet in Signal Hill, California, and talkedabout what they could do to help interestpeople in N scale and to share informa-tion about N scale. The NTRAK projectresulted from that meeting and the idea

is to encourage and promote model rail-roading in N scale. Besides this manual,we keep in touch with N scalers with aNewsletter and help coordinate NTRAKlayouts for public showings. These showsand publications help inform people aboutmodel railroading.

NTRAK layouts combine the beauti-fully detailed modules with long trainsrunning on the two main tracks. A thirdtrack, the branch line, is used for pickingup and setting out cars at the manyindustries along the way. You can be partof this scene by building a module. Thelength of the module you build will be partof the early planning. The 4' modules fitinside most cars and allow enough roomfor industrial and city scenes. The 6'modules will fit in most station wagonsand are large enough to model manyscenes. The big problem with the 8' mod-ules is transporting them. They should beprotected from the wind and rain. Thismeans a van, pickup with a shell or cov-ered trailer. Several modules can be com-bined to model a complex scene.

Since the modules are moved about,construction is a bit different from homelayouts. This manual gives many ideas,but in general remember that there will begreat changes in humidity and tempera-

ture, as well as vibration. The frameworkshould be assembled with glue andscrews. Weight is a problem too, so con-sider plastic foam mountains instead ofplaster. Structures should either be wellglued in place or packed separately. Thekey to good operation is good trackwork.One bad piece of mainline will ruin opera-tions for everyone. The Meet Coordinatormay order repairs or the module removedfrom the layout. Check your turnouts forgauge and that the flangeways are clearof ballast. Gently blowing a singleMicroTrains® truck through the track workwill show up any obstructions or tightspots.

For more copies of the manual, News-letter subscriptions, books and supplies:

NTRAK, Inc.PO Box 3618Parker, CO 80134

For standards questions:Jim FitzGerald, 1150 Wine Country

Place, Templeton, CA 93465. ntrak@tcsn.net

has spread throughout the model rail-road hobby.

The NTRAK modules are used to buildlarge display layouts as well as home andclub layouts. Modelers from all over theworld can build modules, bring them to ashow, connect to the next module, andbecome part of a giant N scale layout. Tobe sure that each module fits the next oneto it, a set of standards was worked out.This manual is the result of experiencegained from building over 2,000 mod-ules. They have been used for NMRANational Convention layouts since 1974and for many regional and local layouts.

Over 100 clubs around the world arenow using the modules for all or part oftheir club layouts. Some have semi-per-manent quarters and others assemblethe layout in space rented or borrowedfor just that meeting. With careful atten-tion to detail, quick assembly and reliableoperation can be achieved. Some of theirsuccessful ideas are shown in thismanual.

In 1996, NTRAK became a non profitcorporation. Our purpose and objective

There are NTRAK clubs in most areas of the United States andCanada. There are also several clubs in Australia and England as wellas clubs in Switzerland, Germany, Holland, Japan and New Zealand.Write to NTRAK for the name of your local coordinator.

NTRAK modules in other countries often use different electrical andsize standards to suit local conditions. Check with your coordinator.

Note: Since the last printing (2002) of the NTRAK Manual, all 120 voltwiring has been removed from modules and Powerpole connectors weremade an option. The new information is covered in this copy. The full textand explanations are on our web site: www.ntrak.org

NTRAK MODULE FLEXIBILITY

This concept is based on 4, 6 &8 foot long modules, plus severalstyles of corner modules. Most ofthe types of modules built so far areshown in this plan. Of course thereare many possible combinations tofit the space available. 12' widelayouts give a good working spacein the “Operating Pit”. On 8' widelayouts the “Pit” is less than 4' wideand can get crowded.

The 4' and 3' corner modules withsix sides have proved to be mostuseful and easy to transport. Plansare shown on Sheets #12 & 13. Toget the maximum mainline radius forinside corners, either an extendedversion of the six sided module isused, or “Transition Modules” (notshown here) are used to swing thetracks to the rear of the module sothat the standard six sided module

can be reversed and used. As shownin this drawing, the “Transition Mod-ules” can also be used in pairs asstandard modules.

Wiring of reversed modules re-quires special adapter cables. De-tails are in the NTRAK Module ‘How-to’ book. By reversing some mod-ules, where space is limited, an aislecan be eliminated, as shown on theright.

4' 4'

4'Aprox.

4'(1220mm)

4'(1220mm)

4'(1

220m

m)

4'(1

220m

m)

6' (1830mm) 8' (2440mm)

6' (1830mm)

12' (

3660

mm

)

Apr

ox 8

'

Some possible wide module variations. Rev

erse

d M

odul

es, s

ee te

xt.

MODULAR LAYOUT IDEAS 3

3'(915mm)

Transition ModulesTrack same distance from the rear

at one end as from the front on otherend.

The corners of your module nust be square.

L1

L2

E2E1

ModuletopD1 D2

Lengths L1 & L2 should be equal, asshould ends e1 & E2. Diagonal dimen-

sions D1 & D2 should be the same

Wiring Note: In all casesthe #1 pin (wide) goes to therail closest to the front. On theWhite line the #1 pin is + DC.

TRW - Cinch #P-302-CCT connec-tors or equal. Colorcode with tape orpaint as indicated

Modules are joined in layout byclamping with two "C" clamps &inserting 5" sections of Atlas "SnapTrack". (Actual length 4.910")

Remove the tie from one end so the rail joiners(Atlas preferred) will slide fully on. Place joinerson the other end, put in place and then, withtweezers, slide joiners into position.

Several units of any length may be combined to form a"module" that is amultiple of 2' in length. (8', 14', 26', etc)

2', 4', 6', 8' (610, 1220, 1830 or 2440 mm)

Skyboard 14" nominal8" min.

Track mustbe straight

Track mustbe straight

Front

4" 4"

Branch line18" min radius1-1/2 % grade

Main lines24" min radius

No grade

24" (

610

mm

)

17"(4

32 m

m)

40"

(101

5 m

m)

floor

to to

p of

rai

l.

Three tracks on 1-1/2" (38 mm) centers

Male ElectricalConnectors this end

RedYellow

Blue

White (DC supply)

wide pin +

Shown on this page are the basicspecifications for standard NTRAKmodules. These are the minimumrequirements for all modules. Optionaltracks, construction methods andmodule sizes are given on other pages.

BASIC NTRAK MODULE 4

Dovetail

Hood

Tongue

Powerpole Connector

For Powerpole information, see page11. Shown here is a single contact case.We use two stacked vertically for trackpower and placed side by side for DCor AC low voltage power supply.

5OPTIONAL FEATURES

“Bridge modules” in 2'and 4' lengths areused to complete alayout with the avail-able full size mod-ules. One foot andthree foot lengths arealso useful. They alsoserve as “duck under”spots for easier entrance to thelayout. They are about 10" widewith the front main tracks backthe normal 4". Skyboards are op-tional and legs aren’t used. Fullwiring is needed.

Narrow gauge (Nn3) makes use of Z scale tracks. Marklin #8500track sections (4-3/8" long) are used for connecting tracks betweenmodules. The center (Yellow) and rear (Blue) tracks are requiredand the front track (Red) is an option. Color codes for the tracks areRed, Yellow, and Blue, each with a center green stripe.

Mountain Divisiontrack. (Use Greencolor code)

Nn3 tracks

2"

15-1/2"17"

18-1/2"

22"20"

Viewer sideof skyboard

4"

6"Top of rail

Set-up track(use green w/yellow stripe ascolor code)

2.5"3-1/

8"

1-1/4"

The set-up track behind the skyboard can beused for behind the scenes removal and set-upof trains. It is used by some as a return looptrack within the module or for a string of mod-ules. Color code the connectors Green with anarrow Yellow center stripe.

Up to 6" may be added to both the frontand rear of modules to make room forscenery or track plans. If extra isadded at the rear, the skyboard shouldstill come forward in some manner tomatch the standard position.

Optional location forBranch line. May be usedwithin groups of mod-ules, but must go back tostandard location at theextreme ends of the mod-ule set.

OptionalDioramaDividerMax sizeshown

Optionalcrossover tracks(use insulating gapson both rails.)

Nominal: 14" (355mm)Min: 8" (203mm)Max: as needed

Optional front track(use Orange color code)

Crossover tracks between the mainlines and branch linetracks are an option. A set of each hand is helpful in anylayout to shift trains from one track to another. Builders of6' and 8' modules are asked to include a set of either handon their modules if they fit with the track plan. Insulatedgaps are needed in both rails of any crossover tracks.Peco or Atlas turnouts are preferred.

For NCat catenarymodule informationsee page 23.

Max

8"

12" M

ax

Skyboard

6"

6"24"

10"

10"

2' or 4'

A

B

C

D

E

FG

H

P

Q

Platform

Gauge

6CONSTRUCTION DETAILS

Note: Detailed drawings ofmodule framework and manybuilding hints can be found inthe NTRAK Module “How-to” Book.

Maximum size ofdiorama divider.

Mainlines -constant elevationsBranch line - 1.5% grade max.

Opening for “C” clampsmin 2”x3”. Keep clampingarea free of wires andequipment.

1/4” eye bolt used as a“no tools” fastener forskyboard.

Atlas “Snap Track” straight 5”sections (actually 4.910” long) areused as connecting track betweenmodules. To get the proper setback, clamp a scrap of plywoodto the end of the module, use a 1/2 section of track as a guide. Laytrack leaving a 1/64” gap. Repeatat the other end and cut rail to fit.

These clearance dimensionsare based on NMRA recom-mendations for N scale andadjusted to the prototype clear-ances for double stack andother modern cars. These clear-ances are used for the three“community property” tracks.Other tracks may have re-stricted clearance. TheNTRAK metal ClearanceGauge is available for $4.00.

Note: Some Atlas track assortmentshave two 1/2 sections of slightly differ-ent length. Use the longer one. (2.455”)

Clamp a scrap of ply-wood to the end of themodule.

Clearance Gauge DimensionsStandard Gauge Narrow GaugeProto N Proto N

A 9’-0” 11/16” 6’-3’ .469”B 4’-0” 5/16” 3’-0” .225”C 6’-0” 7/16” 4’-3” .319”D 12’-0” 29/32” 10’-0” .750”E 4’-0” 5/16” 2’-9” .206”F 2’-6” 3/16” 1’-6” .112”G 6’-9” 15/32” 5’-0” .375”H 23’-0” 1-23/32” 17’-0” 1.275”P 6’-9” 15-32” 4’-9” .356”Q 4’-0” 5/16” 2’-9” .206”

(203 mm)8"

(102 mm)4"

4 x 8 accesson deep

modules only.

20" (508 mm)

17" (432 mm)18-1/2" (470 mm)

12" (305 mm)

24" (610 mm)

3" (75 mm)3"3"3"

Adjust +/- 1" (25mm)

8" m

in14

" (3

55 m

m)

40"

(101

5 m

m)

floo

r to

top

of r

ail

"Tee Nut"

1/64"(.5 mm)

1/2 Atlas2.470" (6

2.74 mm)

(115 mm) 4-1/2"

LEG DETAILS 7

Wing nuts"Tee" nuts

Leg fasteners should beflush with the outsidesurfaces for a neat andsafe assembly.

1 x 4 lumber

1 x 2 lumber

Note:Finished lumber issmaller than sizesshown

40" (

1015

mm

)Note: Legs should be markedfor the corner they go in andwhich module they belong to.Others may have to assembleyour module at some time. Makeit easy for them, and your self.

"Tee" nut

2 x 2 leg2 x 2 leg

Drill min

Floor line normal

5/16" or 3/8" fullthread bolt for adj. 3-1/2" - 3/8" dia full

thread bolt w/washer and 2 nuts.

Threaded rod with "acorn" nuts maybe used in place of full thread bolts.

Lag screws are very difficult toadjust. NOT recommended.

"Tee" nut

Side view

Hardwood blockscrew & glue

Bottom view

Works well forcorner modules

Hanger bolt for top of leg.

Full thread carriagebolt with hole drilledfor hand adjust rod.

Note: If you want modules ata different height for homeuse, the simpliest solution is touse a second set of legs

Some clubs set up their module every few weeks foroperating meetings. Quick assembly and breakdownmeans extra time for running trains. One club calls formodules that can be set up by one person in fiveminutes without tools. Some use furniture legs thatscrew in place. Folding legs are self contained. Bracingusing "Tee" nuts can be fastened with thumb screws.

1/4" Hex bolts ormachine screws

1" (25mm)+/- limits

Drill 3/8" hole3-1/2" into leg

Drill 3/4" holeinto interfaceside of leg

1-1/2"

1-1/4" normal

Note: 2x2 lumberis about 1-1/2" sq.

}

8ELECTRICAL

NOTE: A single large power supply is usedwith the many throttles on large layouts. Thethree tracks MUST NOT have any commonconnection. DO NOT use “COMMONRAIL” wiring. Gaps must be used on bothrails on any crossover tracks. If the three maintracks are part of a yard, it must be possible

to isolate them electrically.

NOTE: For safety, a GFI (Ground FaultInterrupter) circuit breaker is recom-mended in the 120 line powering a layout.

Use #22 to #24 ga solid wire soldered to the outside of rails for connectionto track power leads. “Solder terminal strips” make an easy to trouble shootconnection point. Use as many power feeds per tracks as needed.

Extend all approx20" (500 mm)

Use paint or colored tapeto color code connectors.

Twin conductor lamp cord (zip cord)has a rib pattern for one side. Usefor wide pin for easy checking.

Red Yellow Blue

White

Keep area for“C” clampsclear of wires.See Page 6

Wiring Note: In all casesthe #1 pin (wide) goes to therail closest to the front. On theWhite line the #1 pin is + DC. TRW - Cinch #P-302-CCT

Red - Front mainYellow - Rear mainBlue - Branch line

20ga stranded wireor 18 ga “zip cord”

White - DC supply 16 ga “zip cord”

Keep sockets and outletin center 12" (305mm)

TRW - #S-302-CCT oron short length wires.

2 pin connectors are used to allowisolation of any track for troubleshooting and to place throttlesand blocks at any module.

Front

The 120V AC wiring is no longer used onNTRAK modules. This is fully explained inthis copy of the How-to Book.

Cinch Jones low voltageconnectors are still the stan-dard NTRAK connector. How-ever, the Powerpole connec-tor and heavier wire are nowsuggested for new construc-tion, refurbished modules andwhere DCC is often used.

Front ofmodule

Black

Color

Left EndTrack BusConnector

Right EndTrack BusConnector

Dovetail

Hood

Tongue

Powerpole Connector

See Page 11 formore on Powerpoles

Fig. 1

Fig. 2

Fig. 3

ELECTRICAL 9

POWERING THELAYOUT

For small NTRAK layouts, each main canbe powered by a single throttle controlling asingle train per loop. With layouts over about24' long the three tracks can be broken intofour or more “blocks” each and more trains canbe run. You need two blocks per train for goodcontrol. Single block loops can be powered byregular power packs fitted with Cinch two pinconnectors. In the larger layouts, electricalblocks are formed by using connecting trackswith gaps or insulated rail joiners and notplugging in the connectors at the block bound-aries. Each loop can be divided into severalblocks, each with its own throttle. Better per-formance can be had using the throttle devel-oped for NTRAK. Plans for two versions havebeen published in the Newsletter.

Many larger layouts are now powered withDCC. For very large NTRAK layouts with multiDCC zones, special precautions need to betaken. John Wallis, of the North Raleigh M RRClub has posted instructions and cautions onthe club web site:

www.trainweb.org/nrmrc/There are sequences needed to power up

and power down the various boosters andcontrols, to avoid damage and loss of control.

NTRAK type throttle

To track connectors White connectors

Simple on-off ControlYour siding

Branch line

Main lines

SPSTswitch

Your siding

Branch line

Main lines not shown

Your throttle

DPDTswitch

"Two Cab" type control

POWERING YOURMODULE TRACKS

The private tracks on your module that runinto the branch line track can be poweredseveral different ways. If you have only a sidingor two and don’t plan more than picking up andsetting out cars, then just an on - off switch (Fig2) between your track and the branchline poweris all that is needed. This way locomotives canbe parked on your tracks by turning the switchoff. If you plan more in the way of switching,then, so as not to tie up the branch line throttle,you should furnish your own throttle and con-nect it in with a DPDT, center off switch, (Fig 3).This would be “Two Cab” wiring with the branchline (blue) as one cab and your throttle as theother.

A control panel for your module should usethe same color code for the mainline and branchline tracks as for the connectors. During a showothers may need to operate on your moduleand the controls should be easy to use andclearly marked. Even if you aren’t there toguide them, another operator should be able towork the turnouts and power the tracks with aminimum of confusion. An NTRAK layout isvery much a joint venture, and everyone shouldbe able to operate all parts of it. Complicatedmomentum throttles can cause much confu-sion for first time operators and are bettersaved for the home layout.

ELECTRICAL 10

SOME WIRING TIPSWhen wiring the Cinch 2 pin connec-

tors, the #18 gauge wire can be in-serted through the hole in the connec-tor solder lug and then, when all theloose ends are in place, melt rosin coresolder onto the heated wire. This is oneplace to use a solder gun. The heavier#16 wire is difficult to work through thehole, so simply strip back about 1/4" ofinsulation and “tin” the wire well withsolder so that all the wires turn silver.Hold the wire flat against the lug andflow some more solder on. The lugshould get hot enough that you see themolten solder flow over the surface. Letit cool without moving the parts. A viseor a helper is useful for this part of theoperation. A wrap of electrical tapearound one wire will keep stray wiresfrom causing a short circuit.

NOTE ! Be sure to slide the connec-tor shell over the wire before solderingthe wires to the connectors. You willhave to unsolder the wires to get theshell on if you forget. You seldom forgetmore than once!

CHECKING MODULE WIRING

At the big meets we use a specialtester to make a quick check of wiringbefore the module is placed in thelayout. The tester has a rotary switch, anumber of LED lamps, a battery, con-

nectors for the three track wires and thewhite coded DC power wire, and railcontacts. The unit checks that the wide& narrow pins of the plugs match thewide & narrow pins of the sockets andthat the proper rail is connected to eachpin. It also shows if one or more railsare connected together. Plans for thetester are shown in the NTRAK ‘How-to’ book.

This same test can be made with amultitester (VOM) set on “Rx1” (Resis-tance times one) and a test cord madeby soldering an 8-1/2' length of 2 con-ductor wire to a male Cinch connector.Alligator clips soldered to the other endmake it easier to use, if you don’t haveclips for your meter probes. Mark whichwire goes to the wide pin. Start byplugging the test cord into the Whitesocket and move to the plug end of themodule. Touch the two VOM probestogether. The meter should swing tozero Ohms. Adjust if needed. Now clipone probe to the wide pin test cord wireand touch the wide pin of the Whiteplug with the other probe. The metershould swing close to zero. If it doesand doesn’t move when you touch thenarrow pin, you are over the first bighurdle. If it moves only when you touchthe narrow pin, then you have the wiresreversed and you will have to change(at either end). If the meter moveswhen both pins are touched, then astrand of wire within one of the connec-

tors may be touching the other wire.Correct any problems and recheck.

Now clip to the narrow pin and check asbefore. You now know that the whitewire pins are OK. Next, with one probeclipped to the wide pin and the test wirestill connected to the White socket,touch in turn all the pins of the otherconnectors (Red, Yellow, and Blue).You should get no reading. You havefound that there is no connection be-tween the White wire and any otherwire. Now plug the test cord into theRed socket and test the Red plug asabove. If that checks OK, then touchthe probe to the outside rail of the fronttrack. The meter should go toward zero.You should get no reading as you touch,in turn, each other rail. Repeat, in turn,for the Red narrow pin, Yellow and Bluewide and narrow pins. Check the railson either side of any turnouts and withthe turnouts thrown first in one and thenthe other direction.

These tests will show if there is poorcontact in a turnout or rail joiner, as wellas connectors wired backwards or norail gaps in crossovers.

If trouble develops during use in alayout, a track of the module may beisolated for checking by unplugging theconnectors at each end and removingthe connecting tracks for that track.The other two tracks may continue tooperate.

WIRING CHANGES

The 120V AC wiring is no longerused on NTRAK modules. This isexplained on page 13 Full informa-tion of the Fire Code restrictions arein the How-to Book and on our website: www.ntrak.org

Cinch Jones low voltage connec-tors are still the standard NTRAKconnector. However, the Powerpoleconnector and heavier wire are nowsuggested for new construction, re-furbished modules and where DCCis often used. Powerpoles are alsoless expensive than the Cinch Jonesand are available through NTRAK.

More information on Powerpoleconnectors is on page 11. Informa-tion on working with them is on page13, in the How-to Book and on ourweb site: www,ntrak.org

11Powerpole Connectors

The Anderson “Powerpole” , PP30

In 2005, NTRAK adopted a “Recommended Practice” (RP) for track wiring on mod-ules. A different type connector and heavier gauge wire are used. The original CinchJones connector and wiring size are still acceptable. For new construction and refur-bishing old modules, we prefer that the wiring meet the new RP specifications. The RPand other explanatory material follows.

Here is the connector that is being used as an alternate to our original connector. Theround sleeve on the contact will take 12 gauge stranded wire and can be soldered, crimpedor both. While the wire and contacts will handle 30 amps, our application needs only 3amps, but we benefit from the low resistance of the connectors and heavy wire.

The rugged plastic shells have dovetails that lock the individual units into a variety ofcombinations. We use vertical stacking for the track bus (red, yellow, blue, etc.) wires.The power bus (white) has a side by side assembly. This prevents accidental cross con-nections. The two pin configuration gives us the present trouble shooting ability todisconnect one track while the others remain operational.

These cut-away views show how the contacts slideover each other. These are “genderless” connectors, eachside is the same, but one is upside down.

The dovetails hold the shells together, but colored tape is used to keep the dovetailsfrom sliding and to color code the pair. When Powerpole equipped modules are con-nected together, the connector pairs are turned so that Black connects to Black and Redto Red. NTRAK is stocking both red and black shells and shells in all NTRAK usedcolors. See the NTRAK Newsletter or www.ntrak.org for current pricing.

Note: On our web site, www.ntrak.orgyou will find this RP in color and additionalinformation on the subject.

Purpose of the Recommended PracticeThe original NTRAK standard specify-

ing 18 gauge stranded "zip wire" for maintrack busses, 16 gauge for the "White"coded DC power bus and Cinch-Jones 302Series two pin connectors remains the"standard wiring" for NTRAK modules.For individuals or clubs looking for wir-ing with less voltage loss, the followingare "Recommended Practices" (RPs) whichshould be considered for new construction,refurbishing of existing modules and formodules used primarily with Digital Com-mand Control (DCC). The goal of this RPis to provide a common approach to reduc-ing wire and connector losses and to in-crease the number of power feeds to thetracks.

RP— Track BusEach NTRAK track (red, yellow, blue,

green, etc.) shall have a continuous (un-broken) electrical bus running the lengthof the module. The bus shall be 12-gaugestranded copper zip wire (red/black zipwire, outdoor low-voltage lighting wire orspeaker wire), or equivalent. This wire hasa thin section between the two wires andcan be "zipped" apart. One side of the cov-ering has a rib molded along its length;connect the ribbed wire (or red wire in thecase of red/black zip wire) to the front railof the associated track and to the red orcolored connector at the end of each bus.

The length of the bus wire is the lengthof the module plus 12" at each end.

RP- ConnectorsEach bus will be connected to other mod-

ules using Anderson PP30 30 AmpPowerpole connectors at each end of themodule, as follows:

RP— Color CodingIf red/black pairs of Powerpole connec-

tors are used , they shall be color codedwith tape or paint in accordance withNTRAK color standards, as shown in the2nd column of the color chart above. Al-ternately, appropriate colored Powerpolehousings may be used as shown in the 3rdcolumn above.

RP — Track FeedersEach track shall be connected to its cor-

responding electrical bus by pairs of feederwires located every two feet beginning onefoot from the module end. One or two footlong modules require only one feeder pertrack located at the center of the module.Solid core 18–22 gauge insulated wire shallbe soldered to the outside or bottom of therails and to the electrical bus. Feeder wiresshould be kept as short as possible.

Alternatively, the track feeder may be sol-dered to the rails as described in the para-graph above and connected to a terminalstrip. The unbroken track bus shall con-nect to the terminal strip by wrapping theelectrical bus around one screw or by adrop wire soldered to the bus which is then

NTRAK Alternate Wiring Recommended Practice, 2005

Hood

Dovetail

Tongue

12Powerpole Connectors

terminated on the terminal stripfor distribution. This will permitcorrecting any wiring errors eas-

ily. Screw terminals shall be se-curely tightened and checked fortightness before each train show.

Power Pole to Cinch-Jones adaptercables

White coded are for Power bus.Color coded for a Track bus (Male and

Female needed for each track.)

Left end Track Bus,Black over Red

Power Bus, side by side,White code,12 VDCBrown code.14-16 VAC.

Right end TrackBus, Red over

Black

Note 1: Turnouts shall have feeders installed atboth ends for all mainline tracks, with appropriateinsulated joiners/gaps at the frog end.

Note 2: If unsoldered rail joints are used at anylocation on the mainline tracks, a feeder shall bepresent on both sides of the unsoldered joints.

RP— Private TracksIf the track(s) will only be powered from the con-

necting NTRAK track, then simply connect a pairof feeders from the connecting track bus to the pri-vate track. (If the turnouts are Electrofrog be sure togap both (2) frog rails at the frog end of the turn-out.)

If it is desired to provide alternate local power forprivate tracks (DC power pack or separate DCCbooster), use a DPDT switch. This is, in effect, twocab wiring with the connecting NTRAK track as theprimary cab and the local DC power pack or DCCbooster as the “local” cab.

RP— White WireThe White Wire is NOT required for DCC opera-

tion; however, for compatibility with existingNTRAK modules the white wire must be includedin the module wiring. While the NTRAK ElectricalStandard specifies 16-gauge stranded "zip cord" withCinch-Jones connectors on each end this Recom-mended Practice recommends the same 12-gaugewire used for the Electrical Bus. For the White Wire,Powerpole connectors at both module ends shall bearranged horizontally, red (DC+) on the left and black(DC-) on right, as shown below

Use of the White Wire for private track poweringor accessories is prohibited.

The use of the White Wire for 16VAC supply toDCC Boosters is not permitted, for safety reasons.Boosters shall be powered with a dedicated 120V to16VAC power supply for each Booster.

Individual modules or groups of modules may useBrown/Black coded wire for 12-16 V AC for onmodule power needs. See page 15.

13Powerpole Connectors

Anderson Powerpole® Assembly InstructionsAnderson Powerpole connectors may be soldered and/or crimped. Crimping takes only a frac-

tion of the time and, if properly done, provides an electrical connection that is superior to whatcan be achieved by the vast majority of modelers using solder.

PREPARATIONStrip the wire back 5/16 inch, just enough for the wire to fully fit into the contact barrel. Orient

the contact on the wire so that it will not need to be twisted when inserted into the connector shell.Wire smaller than #14 may be doubled or tripled over to fill the contact opening.

SOLDERINGUse the proper soldering iron, (40 to 125 watts with a 1/8 to 1/4-inch tip) and good electronics

grade solder. (Never use acid flux plumbing solder!) The iron should cause the solder to flownicely into the joint within a few seconds. It is important to have the iron tip clean and shiny andtinned with a fresh coating of solder.

If possible, clamp the wire in a small bench vise with the stripped end up and the contact inplace on the wire. Put the iron tip on the contact at the end of the wire and flow just enough solder

Properly crimpedand soldered

Correct crimp– no solder required

Deformed barrel- discard

Excess solder on barreland tip – remove or

replace

To prevent slippage, it is recom-mended that the shells be secured to-gether by wrapping the rear half of eachpair with colored tape. StandardNTRAK color coding applies.

Place the contact in the appropriate crimper die, withthe seam of the contact barrel against the concave por-tion of the die. Crimp down firmly, using not quite fullforce but not bottoming out the tool. You will noticethat the barrel is now slightly wider than it was origi-nally.

After the initial crimp, the barrel may need to be re-formed to allow proper insertion into the housing. Ro-tate the barrel 90 degrees and place it in the contact -forming die. Squeeze it again, but not as firmly as be-fore to restore the outline of the barrel so that the con-tact will insert easily into the connector shell. repeatthe first crimp if necessary, but with less pressure.

Note: In order to ensure full contact pressure, be surethat after crimping and reforming, the contact tip hasnot been bent down. The profile should be the same asa new contact.

CONNECTOR ASSEMBLYBefore inserting the wires, slide (do not snap) the

connector shells together in the desired configurationusing the molded in dovetails.

Insert the wires with attached contacts into the shellswith the tips of the contacts arching down towards thestainless steel springs. Push them in until they click.

If you have difficulty pushing a contact in, be surethat there is no excess solder on the contact tip or bar-rel, the contact is not bent, and that the contact is ro-tated properly with respect to the housing. Once youhave properly assembled the connector, the wire andcontact should “float” slightly inside the housing andcannot be pulled out.

If you need to remove a contact from its housing, asmall jeweler’s screwdriver or X-acto knife tip can beinserted under the contact tip to disengage it from thespring. The contact and wire may then be pulled outfrom the rear

between the iron tip and the contact to “wet” this junction. Oncesolder starts to flow, add only enough additional solder so that itflows into the inside of the contact barrel and the core of the wire.Too much solder can begin to flow down into the wire’s insula-tion, reducing flexibility, which may cause the wire to break withrepeated flexing. Inspect the completed joint - there should notbe any solder on the outside of the contact. If there is, you mayfile or scrape it off. If there is solder on the contact-mating sur-face, redo the connection with a new contact

CRIMPINGIt is important to use the correct type of crimping tool. Although

a full ratchet crimper will consistently give the best results, inex-pensive pliers-type crimptools can do an excellentjob as well, although alittle practice is required.Both types are availablefrom a number ofsources.

(See http://home.comcast.net/~dstuard/powerpoles/PPcrimp.htm ).

14

NTRAK Layout WiringNTRAK Layout WiringNTRAK Layout WiringNTRAK Layout WiringNTRAK Layout WiringNTRAK 120 V AC Wiring Introduction

There have been major changes in the waywe wire NTRAK Modules and NTRAK Lay-outs. The change that effects all current mod-ules and the way we power NTRAK Layouts isthe result of recent changes in Fire Codes. Theenforcement of these codes is a local issue, somay not apply in your local area, but the Rec-ommended Practices (RP) outlined will, we be-lieve, bring NTRAK modules and Layouts intocompliance with the new codes. All NTRAKLayouts in public places are subject to possibleFire Marshal inspection.

No longer permitted is the hooking togetherof “Power strips” in a daisy chain fashion. Also,extension cords can no longer be “daisy

chained”. Any power strips should be removedfrom existing modules. Only Heavy Duty cordsmay be used, not the common household ex-tension cords. Power strips or multi-tap cubesmay not be plugged into an extension cord.

What this leads to is a commercial grade, ULapproved, power strip (called a “RelocatablePower Tap” in the code) plugged into the walland extension cords plugged into it. Power (120VAC) is no longer distributed around the lay-out through module mounted power strips.

Individual modules may have 120V AC de-vices for lighting, animation or local trainpower, but these devices should be plugged intoan extension cord going to a facility power out-let. Read on for more details.

The photo at the left shows examples of themain components needed now to get power toan NTRAK layout in a public building. Pluggedinto the wall outlet is an optional “GFCI”(Ground Fault Circuit Interrupter) in the formof a unit that plugs into the outlet and has ashort three wire, heavy duty cord. The Com-mercial Grade “Relocatable Power Tap” (whatwe have called “Power Strip”) plugs into theGFCI cord. The Power Tap has a 15’ powercord, a steel body, 8 outlets with rubber coversand a 15 amp circuit breaker/switch. Triple out-let end extension cords plug into the Power Tap.All the layout items needing power then pluginto the extension cords. With eight extensioncords, 24 items could be powered, as long asthe draw doesn’t total over 15 amps.

The New Look for NTRAK Layout Wiring

The 8 outlet unit shown is made for StanleyWorks by Belkin and was purchased at HomeDepot as a “duo” package with the GFCI unitfor just under $30.

The 25’ extension cord (sometimes calleda “Power Block”) came from Ace Hardwareand was less than $20. It is rated as “HeavyDuty”, 15 Amp, 14/3 wire in a “SJ” type cord.Over 50’ should be 12/3 Gauge wire. Homebuilt or repaired cords are not accepted.

Shown below are the key units that I was ableto purchase locally off the shelf. There are manysources for similar items on store and on lineorder web sites.

Note: The following has been reviewed andaccepted by the Eugene, OR Fire Marshal. Fu-ture changes will be made as needed. Checkour web site for current information.www.ntrak..org

Jim F.

AC Power distribution onNTRAK Model Train Modules

The following NTRAK guidelines are basedupon Chapter 6, Section 605 of the InternationalFire Code and applicable sections of Under-writers Laboratories Product Standards UL-817(Cord Sets and Power Supply Cords) and UL-1363 (Relocatable Power Taps), and are be-lieved to comply with most local codes. In theevent of discrepancies, local codes will govern.If there are any questions, consult your localfire marshal.

1) Remove all power strips from modules.Also, remove any module to module AC powercords and outlets from modules.

2) Use a grounded (3-wire) commercialquality power strip (14 AWG cord, prefer-ably 15 ft long) with 15A circuit breaker toplug into an approved branch circuit walloutlet or power drop.

3) Although not required, a GFCI adapteror GFCI pigtail inserted between the outletand the power strip is recommended. Alter-nately, a GFCI equipped power strip may beused in 2) above.

4) Grounded, UL approved (no homebrew!) multi-outlet extension cords (tripleoutlet at the end, or multiple outlets along thelength of the cord) should be used to distrib-ute 120 VAC from the power strip to pointsof need on the layout. Extension cords shouldbe 14 AWG minimum for up to 50 ft, 12 AWGfor 50 to 100 ft.

Extension cords should be placed, wher-ever possible, in non foot traffic areas but notconcealed or covered by equipment. Exten-

120V AC Wiring CHANGES

WIRING & RECENT CHANGES 15

Several things have changed since theNTRAK Manual was last printed in 2002.

Radio ThrottlesOn large layouts we are seeing more use

of Radio Throttles. These allow the opera-tor to follow a train without having to pluga throttle in as you go. DCC as well asAristoCraft Radio throttles are being used.The AristoCraft is designed for G scaletrains sold by Polk Hobbies. A throttle isplaced under the layout and connected tothe track for each electrical block. The ra-dio unit controls the throttle and hence thelocomotive. No special decoders areneeded, just “out of the box” locomotives.The Radio has a different code for eachblock, so the same radio is used on a triparound the layout by just switching chan-nels.

Atlas code 80 TurnoutsAtlas redesigned the code 80 track and

turnouts previously made in Austria. Wehave had no problems with Atlas 2700 se-ries turnouts marked USA or China. Theymay be used on the mainlines as well ason your own tracks. For crossing from onetrack to the next, the #6 size turnouts arepreferred.

Code 55 TrackWhile handlaid track of any size is not

used on the three “Community Property”tracks, Peco code 55 track and turnoutshave proved quite satisfactory. The flextrack is very rugged and not easily dam-

aged because of the lower flange beingburied in the ties. Unfortunately we haven’tfound an easy way to fit Atlas connectingtracks between modules and ask that thelast couple of inches be Atlas code 80 trackwith the permanent rail transition built intoyour module.

As this was written in mid 2002, Atlashad just introduced code 55 track. On theoriginal production track, MicroTrains®standard wheels hit the spikes. For this rea-son we are not allowing this track on thethree main NTRAK tracks. If the dies arechanged so that the majority of equipmentwill run OK, then it will be allowed.

“S” Bend TrackworkWhen doing an “S” bend in your

trackwork, you need to have a straight sec-tion the length of an 85’ car (6-3/8”) be-tween the end of one curve and the start ofthe next curve. This will reduce the chanceof derailment due to the overhanging cou-plers.

Clearance StandardsOn sheet 6 we have clearance gauge di-

mensions. These have been changed to thenew dimensions the railroads are now us-ing because of double stack sizes. The newwidth is 18 feet and height is 23 feet. Theold was a width of 16 feet and a height of22 feet. On an NTRAK layout we will haveall eras of trains in operation, so we needto use the modern clearances for our mod-ules. NTRAK has a metal gauge that maybe used to check your bridges and tunnels.

sion cords can be temporarily attached alongthe bottom of modules above floor using twistties, zip ties, S-hooks, etc. No permanent at-tachment is permitted. Cords should not berouted through clamps and or holes in moduleframes. This should be done neatly.

Damaged cords should be discarded and re-placed. Repairs should not be attempted.

Cords that must be placed in areas subject tofoot traffic should be, at minimum, secured tofloor along their length with tape.

In some jurisdictions, Extension cords sub-jected to foot or equipment traffic must be fur-ther protected from damage:

* Cords 3/8" or less in diameter must be cov-ered with hard plastic "office cord covers" oran approved alternate method.

* Cords larger than 3/8" in diameter mustuse a plywood ramp style cover, or an ap-proved alternate method.

* All cord covers must be secured in placeusing tape, nails or other methods.

5) Power supplies for throttles, boosters andaccessories must be off-module, either on thefloor or a suitable cabinet or shelf under thelayout. (This includes "wall-warts").

6) Throttle, booster and accessory powersupply line cords and wall-warts should beplugged directly into the extension cord out-lets. "Power cubes", multi-taps or other out-let expansion adapters shall not be used.

NOTE: NTRAK Standards and Recom-mended Practices are intended to insure thesuccessful interconnection and interop-eration of modules. How modules arehooked up to venue power is outside ofNTRAK’s control and individuals and/orclubs can do anything they wish, realizingthat other codes and standards may apply.NTRAK will not knowingly advocate any-thing that is against code. The Recom-mended Practices in this document offeran approach that, to the best of NTRAK’sknowledge, will be code compliant in thegreat majority of cases. Whether or not anindividual and/or group decides to imple-ment these recommendations is up to them

The full RP for 120 V AC wiring isprinted in the current NTRAK Module‘How-to’ Book and on our web site:

www.ntrak.org.

Local option powerFor those who need power to their mod-

ule for lighting, animation or track power,a low voltage wire that is coded browncan be used for 12-16 V DC. This wirewould have the side by side Powerpoleconfiguration, as with the white line, Itcould be on just one module or a group ofmodules. There would be a single sourcefor the low voltage AC such as a powerpack or an outdoor lighting transformer.

A bridge rectifier could be used to con-vert to DC, as needed. The power sourcewould plug into one of the layout exten-sion cords. The brown wire would onlybe added to modules needing the extrapower and not to every module in the club.

The low voltage wiring is not subject toFire Regulations, but should be done in aneat and safe way.

CORNER MODULES 16

Fig. 1

Fig. 2

90°

Fig. 3

Fig. 4

90°

90°

29"

12"

8"

8"

4"

4"

6"

24"

251 / 2

"221/2 "

301/2 "

32"

24"

24"

17"

36"

24"

24"

24"

17"

17"

23-1

1/16

"23-11/16"

26 7/8"

36"

24"

737 mm

305 mm

203 mm

203 mm

102 mm

102 mm

152 mm

610 mm

648

mm572 m

m

775 mm

813 mm

610 mm

610 mm

610 mm

432 mm

915 mm

432

mm

432 mm

602

mm

602 mm

683 mm

915

mm

610

mm

610

mm

610

mm

Bein

Bein

FOUR FOOT CORNER THREE FOOT CORNER

1/2" or 3/8" plywoodtop

1 x 4 or 1/2" plyframing

Assemble withscrews and glue.

Note: The two module joining facesmust be square with each other.

Joiningmodule face

Joiningmodule face

LegLeg

LegLeg

Leg

Leg

Leg

Glue blocks

2 x 4 glue blocks3 identical. Short side

3-5/8" long

1-1/2 x 1-1/2 glue blocks

1-1/2 x 1-1/2 glue blocks

Notch joint

Aprox 3' cut to fit

Aprox 3'cut to fit

Reinforce withglue blocks

CORNER MODULES 17

The six sided NTRAK corner modules arebasically a 4' or 3' square with two corners cutoff. The 4' corners are almost 6 feet long and34" wide, giving them room for a roundhouseor other larger scenes. A similar corner mod-ule based on a 3' square is easier to store andtransport. A layout can be assembled with amixture of two 4' and two 3' corners.

NOTE: It is most important that the two faces that mate withother modules be square with each other. If you use a plywoodtop, use a factory cut corner for these two faces. If you build anopen grid version, the use of the corner of a plywood sheet asa square during assembly is suggested.

Datasheets with full instructions for building a jig for assem-bling either size corner module or any straight module isavailable from NTRAK, Inc. The jig is suitable for club usewhen building a number of modules.

All key dimensions are given, but some dimen-sions are not given since they are governed by thethickness of the materials used. Where the twobraces cross, they could be notched to fit together,or one could be solid and the other in two piecesthat butt against it. The use of screws, glue, andglue blocks will make a solid and long lasting basefor your track and scenery.

A transition curve is needed where a curved length oftrack meets a tangent (straight) track. The transitionwill avoid the misalignment of the ends of longer carsas they pass from the curve to tangent track.

Superelevation (banked curves) are not recom-mended. Longer trains can be run with flat curves thancan be run with superelevation.

A smooth transition at the ends of a curve can be laid

out by eye by using flex track as a “bent stick”, as shown here.The first 1-1/2" of track must be straight to meet NTRAK specs(4" in from end of module). It is suggested that track beextended to or beyond the module edge and then trimmed tolength after the laying of the transition curve is completed. Thiswill make it easier to keep the 1-1/2" length straight. The trackis restrained by pins or nails at the points marked with smallcircles. Check it out by pushing several long passenger carsthrough the transition. If the ends of the long cars stay alignedcoming out of the curve, without relative motion from side toside, then the transition is good. If not adjust the track andrecheck. Avoid sharp kinks in the rails.

Where two pieces of track must be joined on a curve, solderthe rail joiners in place with the track straight and then form thecurve.

There isn’t enough room for a full transition on the three footcorner, but enough easing can be done to make problems withlong cars minimal on these corners.

4''

''

1 4

1 4

R 1 4 R

Moduleedge Simplified transition curve

Track laidon centerline

S 9 S 1

S 7

S 14

S 10S 10 S 1S 10

18

These track plans are among the over 100 plans, drawn to1/2"=1' scale, shown in the Track Plan Set available fromNTRAK. Plan S-9 shows the branchline swinging away fromthe mainlines and has a simple siding that leaves ampleroom for scenery on the four foot module. Plan S-7 on theother hand puts a maximum of track on a four foot module.Plan S-1 gives room for several industries and interestingswitching problems on a six foot module.

Two or more modules can be combined and always usedtogether. With S-14 & C-11 a corner and a four foot modulehave been combined for a terminal facility. This makes anexcellent end for a point to point home layout. Below are twomodules combined for a through passenger terminal.

The big layout is 22’x41' is also made from the Track PlanSet and would make an excellent club layout. Photos ofmany of the template modules are shown in the NTRAKModule ‘How-to’ Book.

NTRAK MODULE IDEAS

LIGHT WEIGHT MODULES

NTRAK Moduleconstructed of

plywood with 8" wide,front box beam.

Front frame coversedge of plywood top.

Corner glueblocks

1/2" sq glue strips

Plywood topextends overend pieces

and rear frame.

Sheetrock screws

Front BoxBeam

Plywood pads to hold "T"nuts and retainer squares.For mounting skyboard.

7" openingsat each end

"C" clamppads

Lighter WeightModules

The frame design shown in the manual hasbeen used since the beginning of NTRAK. Ituses easy to find materials and can be madewith simple tools and with basic woodworkingskills. A much lighter frame can be built along thesame lines as the original design, but using 1/2"plywood for the four frame pieces and 3/8”plywood for the top and skyboard. If you usethree bolts to hold the skyboard in place, itbecomes structural and adds stiffness.

If you have power tools available, then evenlighter weight modules can be built. One suchdesign is shown here. It uses 3/8” plywood forthe frame pieces. They are doubled where the“C” clamps go and where the “T” nuts hold theskyboard in place. The top could be 3/8” ply-wood, or if the extra “box beam” is used, the topwould have extra support and 1/4” thick plywould be suitable. The box beam stiffens themodule and reduces both sag and twist. Gluestrips are used at the seams and glue blocks forthe corners.

A full discussion of the lighter weight designsis covered in Data Sheet #4.3.1.

(Optional)

19

JUNCTION MODULES

Layout usingJunction Modules

20

Junction ModulesTo join several clubs into one big layout,

the Junction Module was developed byMatt Schaefer and the Northern VirginiaNTRAK Club. The design was inspired bythe six sided “Diamond Mill” by DaveSavage and Paul Miller. It was used for thehuge ’93 Valley Forge layout.

The dotted lines show the concept of add-ing an extension to a corner module. Theactual junction module frames are madejust for their use and ignore the dotted lineshown. A 3' size is shown. Some 4' ver-sions are also used.

When the layout is in operation, the twoinner tracks of each oval are traditionalNTRAK ovals. The outside track, how-ever, goes completely around the layout.It can be 30 to 40 scale miles around oneof these big layouts. The operator followshis train using radio throttles, either DCCor AristoCraft.

Junction modules are built in left andright hand versions and there are severaltrack plans in use. Other versions are usedfor oNeTRAK layouts, shown on the nextpage.

You need three electrical gaps in thetrack and double pole, double throwswitches to correct the polarity in thetracks connecting to the next loop.

Gaps

A 3' Corner Moduleconverted into a Junction

Module3' x 5'

Electrical gaps addedto the tracks.

oNeTRAK MODULES

RegularNTRAK Layout

Junction Module

Special Junction Moduleor Regular may be used.

Special 3' CornerModules

oNeTRAK LayoutBased on Orlando 1998

"Off set"style

module

180°Turn-around

Module

Standard 12" x 4'oNeTRAK Module

"Bump out"style

module

Wide 18" x 4'oNeTRAK Module

oNeTRAKModules

Pioneered by the Northern VirginiaNTRAK Club, the basic module is a onefoot wide and four foot long unit with asingle track anywhere in the middle 4"area of the module. They can be wider,they can have two or more tracks, theycan have an offset “S” bend or justabout any design that you feel would beworkable. The idea is to come off of aregular NTRAK oval and get into abranchline, single track, type layoutthat can be used for switching opera-tions, possibly DCC controls and befree of the high density traffic on theNTRAK main layout.

The concept is proving popular with anumber of clubs and individuals. Theunits can be used with, or as, a homelayout. They are easily moved or takento a big show. They can be used with orwithout a skyboard. The electrical wir-ing is the same as NTRAK and theheight is the standard 40”. For otherheights, use a second set of legs. Thenarrower units are easy to transport orstore.

At some of the big layouts, theoNeTRAK modules have made up aloop of their own within the big NTRAKlayout. Grades may be used, if thegroup wishes it. Only shorter trainswould be dispatched into this loop,leaving the main layout for the longtrains.

The oNeTRAK Manual, $3.00 givesmore details.

21

12" max

12" max

4" wide track area

12" min36" max

4' Standard1', 2' 3', 5', 6' Optional

1-1/2"

4"

22SPECIFICATIONS

NTRAK MODULE GUIDELINES

REQUIREMENTSSIZE: The basic length is multiples of

2' (610mm). The height from floor to topof rail is 40" (1015mm) with adjustmentfor 1" (25mm) above and below that. Thenormal depth of modules is 2'(610mm).A skyboard is located at the rear of themodule.

TRACKS: Three tracks are common toall modules and are regarded as “commu-nity property”. The track centers are mea-sured forward from the skyboard at eachend of the module. The distance, name,and color code for these tracks are:

20" (508mm) Front main,Red.

18.5" (470mm) Inner main,Yellow.

17" (432mm) Branch line,Blue.

Normal track connection between mod-ules is with a 5" Atlas Snap track section(nominal length 4.910"). Code 80 nickelsilver flextrack such as Atlas or Peco arerecommended for the three “communityproperty” tracks. If code 55 Peco,Railcraft or Shinohara track is used, thelast inch or two should have Atlas rail foreasy mating with the Atlas connectingtracks. For reliability reasons, sectionaltrack or hand laid track is discouraged.Uncoupling ramps on the three tracksshould be electric or, if the permanentmagnet type, mounted to drop away or beeasily removed. There are no trackworkrestrictions on “private” tracks on themodule.

The minimum radius for the two maintracks is 24" (610mm) and no grades arepermitted. The Branch line minimum ra-dius is 18" with a 1-1/2% grade limit (3/16" per foot). The first 4" in from the endsshould be straight. Minimum track spac-ing is 1-1/4". Minimum setback from frontof module is 2".

WIRING:120 V AC wiring is no longer used on

NTRAK modules. Any accessories wouldbe powered by an extension cord. See page13 for details.

See page 11 for details on Cinch-Jonesand Powerpole track power connectors.

Do not use common rail type track wir-ing. There should be no electrical connec-tion between any of the rails of the threetracks. Use insulated gaps in both rails forany crossover tracks.

The module owner is to furnish two “C”clamps (at least 3" size) and four connect-ing track sections for each module; one w/insulated gaps.

All switches and turnout controls shouldbe clearly marked so that another personcan quickly operate them in your absence.

OPTIONSSIZE: An additional 6" may be added to

either or both the front and back of themodule. Modules may be made narrowerthan 2', but except for “bridge modules”aren’t encouraged. The preferred skyboardheight above the rail tops is 14", but maybe as low as 8" or as high as needed foryour scenery. Skyboards may be remov-

able or permanent for scenery protection.On extra deep modules the skyboardshould end even with the standard skyboardlocation. The skyboard may have artwork,commercial backgrounds, or just bepainted a sky color. The back of theskyboard should also be painted, blue pre-ferred. Module frame work and legs shouldbe painted dark brown or flat black. “Di-orama Dividers” may be used at the endsof the skyboard. Some groups set “stan-dard hill contours” for blending scenerybetween modules.

Each module should have its own legs.Shared leg schemes are not recommended.“Bridge” modules and special moduleswithout legs may be used with the approvalof the meet coordinator, but must meet alltrack and wiring requirements.

Tunnels are discouraged on the three“community property” tracks. If used, pro-vide easy access for track cleaning and re-railing of cars.

TRACKS: There are standard locationsand color codes for additional tracks.

Mountain Division, Green, 4"(102mm)from skyboard, 3-1/8"(80mm) above nor-mal height, 12" min. radius, 3% max.grade.

Set-up track, Green w/ yellow stripe, 1-1/4" behind front of skyboard.

Front passing track, Orange, 1-1/2" infront of Front main.

Narrow gauge (Nn3) tracks use Z gaugetrack and Marklin track sections as con-necting tracks between modules. The reartrack is 6" in front of the skyboard and 2.5"

above normal track height. Color code isBlue w/ Green stripe. The middle track is15.5" in front of the skyboard and at tracklevel. It is color coded Yellow w/ Greenstripe. The optional front track is 22" for-ward and 2" below track height. It is codedRed w/ Green stripe.

Catenary tracks (NCat). The standardsare shown on page 15 for modules usinglive overhead wire.

There is an optional location for theBranchline 10" from the skyboard. Thisavoids the three track mainline look.

Crossover tracks between the Mainlinetracks and between the Inner main andBranch line track are suggested on 6' and8' modules. They are optional on others.Peco large radius, USA made Atlas #6 orShinohara #6 turnouts are recommended.Pre 1993 Atlas turnouts made in Austriahave been a source of problems and arediscouraged, as is steel rail track such asRapido. Insulating gaps must be providedon both rails of any crossover tracks. Thereshould be no common rail connection be-tween any of the three “community prop-erty” tracks.

Transition curves are recommended toease long cars into curves. Superelevation(banked turns) are NOT recommended.

Several units of any length may be com-bined to form a “module” that is a mul-tiple of two feet (8', 14', etc.). The threetracks must be continuous, but only needto meet the standard spacing at the outerends and meet the minimum 1.25" spac-ing elsewhere. Electrical connections onlyneed to be standard at the ends.

MATERIALS LIST 23

MATERIALS NEEDED FOR A 6' NTRAK MODULE

Where less is needed for a 4' Module [4] or more for an 8' Module [8], theseare indicated below.

TRACK: (Minimum for Mainlines and Branch line, no spurs, sidings, etc)18' - Flex track, Atlas, Peco, or equal. [4]= 12',[8]= 24'4 - Turnouts, Shinohara #6 or Peco, large radius, #SL-388X, RHor 389X, LH. [4]= none required.3 - 5" Atlas “Snap Track” sections.1 - 2-1/2" Atlas 1/2 section. Used as spacing jig only.Any accurately cut rail or rod 2.470" long may be used.Ballast and cork roadbed as required.ELECTRICAL:120 V AC wiring is no longer used on NTRAK modules. Any accessories would be

powered by an extension cord. See page 13 for details.See page 11 for details on Cinch-Jones and Powerpole track power connectors.

LUMBER: List depends on the construction method used.Note: Finished lumber is smaller than sizes shown.For plywood table top construction you would need:1 - Skyboard, plywood, 3/8" or 1/2"x 18"x 72". [4]= 48", [8]= 96"1 - Tabletop, plywood, 3/8" or 1/2"x 24"x 72". [4]= 48", [8]= 96"16' - 2x2 lumber for legs and glue blocks. (legs 38" long)16' - 1x4 lumber, for frames. [4]= 12', [8]= 20'(1/2" or 3/4" ply may be used for frames.)HARDWARE: Depends on construction method, but should include:4 - Leg leveling bolts w/ nuts or “Tee nuts”.8 - Leg attachment bolts w/ washers and nuts or “Tee nuts”.2 or more bolts to mount Skyboard. “Eye bolts” may be used.Misc flat head screws for assembly of frame.Glue. Aliphatic resin, “Professional” type, preferred.Paint, Dark Brown or flat Black for legs and frame. Light Blue for Skyboard.

This manual represents the experience and learning of many modelers since the NTRAK idea started in 1973.This is the fifth version of the manual. Over 30,000 copies of the previous versions have been printed. Changesin NTRAK specifications are made at infrequent intervals. Original modules will work with present modules.

13"

2"

8"

StandardNTRAK

track spacing

15"2"

Standard NCattrack locations

2"

10"R30"

SUMMARY OF TRACK REQUIREMENTS AND OPTIONSTrack Req/ Dist frm Min Max Color

Opt Skyboard Height Radius Grade CodeFront Main R 20" 0" 24" 0% RedInner Main R 18.5" 0" 24" 0% YellowBranch Line R 17" 0" 18" 1.5% BlueBranch option O 10" 0" 18" 1.5% Blue w/YellowMountain Division O 4" +3-1/8" 12" 3% GreenSet-up Track O -1-1/4" 0" ? ? Green w/YellowFront Passing Trk O 21.5" 0" ? ? OrangeNn3 Front Track O 22" -2" ? ? Red w/GreenNn3 Center Track R* 15.5" 0" ? ? Yellow w/

GreenNn3 Rear Track R* 6" +2.5" ? ? Blue w/

GreenNCat Front Track R* 15" 0" 10" ? Special plugsNCat Rear Track R* 2" 0" 10" ? Special plugs R* = Required only on these modules. ? = No standards set.

CATENARY MODULESElectric type locomotives operating

under live overhead wire are a featureof the NCat modules. Shown below arethe required tracks for NCat modules.Additional tracks and sidings are thechoice of the builder. Complete speci-fications and tips on building poles andstringing catenary wire are available

from the coordinator. More informationis also on their web site:www.teamsavage.com/ncat/ncat.html

Tom SavagePO Box 75Bethpage, NY 11714ncat1@teamsavage.com

24LAYOUT CHECKLISTS

THINGS TO CHECK BEFORE YOUGO TO A MEET

1. Be sure that your module meets thecurrent NTRAK Specifications.

2. Have all flangeways clear of ballast andturnouts working properly.

3. Check wheel gauge and couplers. Try yourengines and long cars to be sure everythingoperates and that you have the proper clear-ances.

4. Have your controls working, clearly marked,and color coded.

5. Your scenery should look so great that youdon’t have to apologize!

THINGS TO TAKE ALONG

1. For each module: two “C” clamps, fourconnecting tracks, one w/ insulating gaps. (Re-move one tie or undercut so that rail joiners gofully on at one end of all connecting tracksections.)

2. Any tools needed for assembly and anytools, glues, paint, etc. for last minute repairs ofthe module. Have your name on everything!

3. Throttle and cords, if needed.4. Cars and engines all marked for easy

identification with your personal code. An in-ventory list can be a big help. Don’t leaveengines on the layout overnight or on a sidingin easy reach during the show. Be very watch-ful of your things during tear down. Security islax then, and, in the confusion, things candisappear.

5. If you plan to enter your module in acontest, it may have to be in the contest roomfor judging. If so, you should furnish a threetrack “bridge” so the layout can operate whileyour module is being judged.

IF YOU ARE COORDINATING A MEET

CONFIRM THE SPACE: Measure the spaceyourself or have someone do it for you. The hotelor exhibit hall drawings are often quite optimistic.One room was about two feet smaller in bothdirections than advertised. While you are settingup is NOT the time to find out about this. Notelocations of pillars that might interfere with thelayout, visitors entrance, the loading dock area,and parking.ELECTRICAL: Check the location of electri-

cal outlets. Avoid having cords across an aisle ifpossible. In some exhibit halls they can placeoutlets overhead to suit. Locate circuit breakersand light switches.SET UP: Find out when you can start setting

things up and the hours of the show. Start set upas early as possible so that the layout is runningsmoothly for the visitors.TEAR DOWN: Be sure that everyone knows

when layout tear down will start. One person can’tpull his module out ahead of time and leavewithout advance warning and planning. TheNTRAK layout shouldn’t be torn down while otherexhibits are still open.APPEARANCE: For a good appearance, the

legs of the modules and the boxes of tools andjunk should be hidden by a drape. These areoften furnished by the convention, or tableclothscan be thumb tacked in place. Check ahead oftime. For public shows a barrier about two feet outfrom the layout is a necessity.LAYOUT PLAN: Have a layout plan made up

ahead of time. Copies should go to all partici-pants. The first persons to get to the set up shouldknow where the layout will be and the arrange-ment of the modules.ELECTRICAL: The modules should be

checked electrically before they are connected

together. Plans for a special checker are shownin the ‘How-to’ book.LEVELING: If the floor is level, start with all

modules at 40" height. Floor tiles or carpet pat-terns can be a big help in getting the layoutsquare. A fishing line pulled taut can be used inleveling modules. An “eyeball” check for dips,humps, zigs and zags is also helpful. On verylarge layouts a transit or builders level is useful,if you have people who know how to use them.Cumulative errors can make one side of thelayout longer than the other. Two foot lengths of2x4, 1x4 or 1/2" plywood can be clamped be-tween modules as needed to even things up andthen fit with filler track as needed.BRIDGE MODULES: A 2' and 4' three track

“bridge” can be useful in case some moduledoesn’t show, or if the module lengths that areavailable don’t come out even. The bridge makesa good “duck under” entrance to the operatingpit. If any of the modules are to be moved into thecontest room for judging, then the builder shouldfurnish a “bridge” while his module is out of thelayout.

SET UP SEQUENCESET UP SEQUENCESET UP SEQUENCESET UP SEQUENCESET UP SEQUENCE1. Get module legs in place and adjust so the

roadbed is 40" above floor. (It is easier to mea-sure to the roadbed.)

2. Make electrical check of each module beforeconnecting to other modules.

3. Clamp modules together, level, and align.4. Put gapped rail connector tracks at block

boundaries.5. Put in all other connector tracks.6. Connect 110 and track wiring connectors

between modules. (Don’t connect track wiring atgapped rail tracks.)

7. Connect throttles.8. Have fun!!!