8/19/2019 GE ES 44 AC VS. C 45 ACCTE FROM UNION PACIFIC.doc
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GE ES44AC vs. C45ACCTE
Date: 11/14/08 20:54GE ES44AC vs. C45ACCTE
Author:schmo As I understand it--but I may be
mistaken -the UPs !"#$s are actua%%y desi&nated'(45A(()"s'
rather than '"*44A(s'+ Is the ()" or 'contro%ed tracti,e eort'
eature uni.ue toUPs %ocos hat does the ()" eature do in actua%
oeration o the %ocomoti,e and trainhand%in&
)han3*chmoDate: 11/14/08 22:02Re: GE ES44AC vs. C45ACCTE
Author: redneckrai%ancorrect UP chooses to c%ass the !"
"*44A( as '(45A(()"'+ ike6ise the A(4400( 6as(44A( and the
A(4400(-()" is c%assed as (44A(()"+(urrent%y UP is the on%y
rai%road 6ho uses the ()" sot6are+ )he o%der mode% A(4400(s7(44A(s
are bein& u&raded 6ith the ()" sot6are and rec%assed
(44A(()"s as 6e%%+*im%y ut the ()" sot6are is used to reduce the
tracti,e eort o the %ocomoti,e 6hen it isused as a DPU 7distributed
o6er unit in mied rei&ht tye ser,ice+ )he hi&her
tracti,e eort o
the A( units 6hen mid train or on the rear can be too much or
the %i&hter trains+ )his is notnecessari%y the case in bu%k
commodity ser,ice thou&h such as unit coa% or &rain
trains+*omeone e%se 6i%% ha,e to better e%ain 6hy this is
necessary+9ryan ones9rooks ;<Date: 11/14/08 22:0=Re: GE ES44AC
vs. C45ACCTE
Author: imr%)he e%anation abo,e is basica%%y correct+ )o
add on to that I ha,e had on%y one ()" trainbeore and maniest 6ith
DP+ )he rear DP unit 6as %imited to a maimum o on%y 100;
tractioneort+ I ha,e had bu%k trains in DP runnin& under u%%
tracti,e eort sho6 1>0; tracti,e eort
beore so it does %imit them substantia%%y+ )he reason bein&
that they dont 6ant to o one othe %i&ht cars out in the midd%e
o the train %ike a ?it+ $n bu%k trains 6here the consist is
air%yuniorm its not that bi& o a dea%+Date: 11/14/08
22:2>Re: GE ES44AC vs. C45ACCTE
Author: b%e>=2 As stated a%ready ()" basica%%y
reduces the amount o tracti,e eort the %ocomoti,es can utout
6ithout sacriicin& dynamic brakin&+ )he UP **I 7*ystem
*ecia% Instructions says unitsare %imited to 110; in tracti,e eort
6hen in ()"+ An eam%e: *tandard maniest trains can ha,e 2@
a%es o o6er ushin& on the rear o a train+I you ha,e t6o
(45A(-()"s 7or (44A(-()"s at 12 a%es o o6er er unit then you
6ou%dha,e 24 o6ered a%es+ )hat is ob,ious%y too much+ )he so%ution
is to %ink u the DPU o6er in()" mode+ )his reduces the a%es o o6er
rom 12 to 11 on the DPU 7distributed o6er unit %inked he%er
unit+ ith the 12 a%es o o6er rom the other unit on the rear this
%ea,es 2@ a%eso o6er ushin& on the rear+ o6 you are &ood to
&o and you did it 6ithout sacriicin& anydynamic brakin&
6hich remains the same 6hether %inked in ()" or B)" 7u%% tracti,e
eort+ A%% this aside a ne6 %an is comin& on Conday o,ember
1th 6ith the issuin& o a ne6 **I+ Iha,e yet to see it myse% but
ha,e been to%d someho6 they ha,e i&ured out ne6 6ays to
crame,en more tonna&e on trains 6hi%e sti%% makin& them
%e&a%+ e 6i%% see Eust ho6 rea%istic theyare+++Date: 11/15/08
0>:05Re: GE ES44AC vs. C45ACCTE
Author: 2ebri&htFe&ardin& the reduction in
tracti,e eort 6hi%e in ()" mode+ Is the amount o )"
reductioncontro%%ab%e by the en&ineer or does it dro to a re
se%ected amount ets say that the en&ineer determines that
he needs Eust =0000G )" rom the DPU he%er+ (an he se%ect this
amount or is
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8/19/2019 GE ES 44 AC VS. C 45 ACCTE FROM UNION PACIFIC.doc
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he %imited to the re set i&ure And 6ho determines that the
()" reduction is needed in the irst%ace: the en&ineer or
somethin& %ike the 'o6er desk' 7i that is the ri&ht
termDickDate: 11/15/08 0:4Re: GE ES44AC vs. C45ACCTE
Author: *$$>>1It isnt se%ectab%e ecet by the erson
6ho 6rote the sot6are that contro%s it+ )he choice 6as tomake the
%imit the same as a D( motored Dash-= 6ou%d roduce or ease o
train-hand%in&
ca%cu%ation+Date: 11/15/08 08:0=Re: GE ES44AC vs. C45ACCTE
Author: tcho6ee$ne .uestion or you+ Ho6 %on& 6ere you
stuck on that brid&e at *anta Be unction beore thatUP coa%
train 6ent do6n the Bort *cott *ub I 6as back there %ate *etember
this year and &othosed 6aitin& or a UP coa% train to %ea,e
or a%most 2 hours+ ucki%y the trans con hi&h %ine 6as,ery
busy+Date: 11/15/08 08:2>Re: GE ES44AC vs. C45ACCTE
Author: schmo
ucki%y didnt ha,e to 6ait too %on&+ e chan&ed %ocation
to the to o the rid&e to shoot the Hi&hine 9rid&e as it
turned out+Date: 11/15/08 0=:14CTE mode selection
Author: riscoEoehen conditionin& and/or %inkin&
the DP consist7s ho6 does one se%ect ()" mode Is it ase%ection on
the I(" screenDate: 11/15/08 10:50Re: CTE mode selection
Author: *cottI be%ie,e the 1th is 6hen UP decides that
trains are no %on&er assi&ned o6er based on HP))
7horseo6er er trai%in& ton but instead by )PA 7tons er
o6ered a%eDate: 11/15/08 11:0Re: CTE mode selection
Author: &reendot)o ut it in sim%e terms +++'()"' mode
turns a (44A( into the e.ui,a%ent o a Dash-= in terms o maimum
tracti,e eort%imitin& it to 110000 ounds maimum+'()"' mode
turns a (45A( into the e.ui,a%ent o an "*44D( in terms o maimum
tracti,eeort %imitin& it to 110000 ounds maimum+ A 'bu' or
comressi,e orce o about 220000-225000 ounds is the maimum a%%o6ed
on therear-end o trains 6hich are not c%assiied as 'bu%k' 7%oaded
coa% &rain soda ash etc+ a%% 1@2 ton
cars or hea,ier+ithout ()" a train cou%d sti%% ha,e or eam%e a
(44A( and an *D=04@A( on the rear endoeratin& in DP mode but
the en&ineer 6ou%d ha,e to run the remote consist in
'asynchronous'mode manua%%y contro%%in& the thrott%e to a,oid
eceedin& the 220000-225000 ound %imit onbu orce+ ith ()" mode
the en&ineer doesnt ha,e to '6atch the rear-end tracti,e
eort'+()" is a sim%e 6ay o ro,idin& the e.ui,a%ent o D(-motored
units 6hi%e retainin& the %eibi%ityo doin& it 6ith A(
traction+Date: 11/15/08 11:0=Re: CTE mode selection
Author: b%e>=2
*e%ectin& ()" or B)" is done on the comuter screen 7or
Harris bo o the contro%%in& DPU unitdurin& the rocess o
%inkin&+ $nce a mode is se%ected you can not chan&e bet6een
the t6omodes 6ithout un%inkin& com%et%y and then re%inkin&
a&ain+
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