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Category: Prototype Reference for Modelers
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Phases of Union Pacific AC4400/C44AC-CTEs.

Telling the difference between UP AC4400's (AC4400CW), from SP, CNW & UP, plus UP C44AC-CTE's (AC4400CW-CTE), in short.

Again, in the quest to find myself a UP unit to model, this time a AC4400CW, I've started mapping out the differences and "phases" of UP AC4400CW's and C44AC-CTE's.  This list may be incomplete, please excuse me if something is missing or wrong. I hope to get some input to make the list way more specific.

I picked up an Athearn HO AC4400 with three dynamic brake vents so I now need to find one with 3 on UP's roster. I chose UP [url=http://www.locophotos.com/PhotoDetails.php?PhotoID=36891]6717[/url] because I like the winged shield on it. I plan to model at least 2 more of these units, one of the 3 UP delivered, and one in C&NW paint. - All C44AC-CTE's are referred to this way as they have a Controlled Tractive Effort add-on. All have two dynamic brake vents.

All Ex. SP AC4400CW's have two dynamic brake vents. Some have been repainted in to various UP schemes, some are only patched. Not a single one exists in full SP paint w/o a patch as of article date. Two units have erroneous schemes see notes 1 & 2 below.

Only 3 UP AC4400CW's were delivered with three dynamic brake vents.

All Ex. C&NW AC4400CW's have three dynamic brake vents. Some repainted, others not. All are at least patched as of time of article, and ones still in C&NW sport Operation Lifesaver paint. One unit was repainted but still has Operation Life saver paint, see note 3 below the list.

Prototype number ranges:

5554-5694 C44AC-CTE, Two (2) dynamic brake vents.

5700-5863 C44AC-CTE, Two (2) dynamic brake vents.

5864-5981 C44AC-CTE, Two (2) dynamic brake vents.

5982-6081 C44AC-CTE, Two (2) dynamic brake vents.

6148-6420 AC4400CW, Two (2) dynamic brake vents, Ex. SP 100-378, Not in SP sequence, some repainted, some patched, check prototype photos. 1 2

6421-6424 AC4400CW, Two (2) dynamic brake vents, Ex. SP 221, 249, 256, 279, some repainted, some patched, check prototype photos.

6430-6549 AC4400CW, Two (2) dynamic brake vents,

6550-6699 AC4400CW, Two (2) dynamic brake vents,

6700-6702 AC4400CW, Three (3) dynamic brake vents, Ex. UP 9997-9999.

6703-6737 AC4400CW, Three (3) dynamic brake vents, Ex. C&NW 8801-8835, some repainted some patched, check prototype photos. 3

6738-6887 AC4400CW, Two (2) dynamic brake vents, straight stripe, small UP logo on nose. 4

6995-6999 AC4400CW, Two (2) dynamic brake vents, straight stripe, small UP logo on nose.

7000-7009 AC4400CW, Two (2) dynamic brake vents,Ex. GECX 4000-4009, 5

7080-7297 AC4400CW, Two (2) dynamic brake vents.

1 UP 6344 was repainted into a UP scheme, but lacks the yellow paint. View it here.

2 UP 6361 was patched and "Union Pacific" letters added to the long hood. View it here.

3 UP 6736 was repainted, but bears a "We Will Deliver" scheme, with the Operation Lifesaver logo. View it here.

4 UP 6877 was repainted into the modern lightning stripe scheme with a winged shield. View it here.

5 UP 7000, 7001, & 7003 at least, have not had UP lettering added. View 7000 here.

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