Old 12-14-2005, 01:53 AM   #1
tomcatchamp
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Default How can you tell ?

I'm a big fan of the western railroads, specifically the Union Pacific and all it's merger roads. I have a question regarding some of the UP engine designators and how to tell the differences between the 2 or how ever many there are. I have seen many photos at this website and in magazines of both the AC4400CW and the AC4400CW-CTE as well as the new GEVO's AC45CWCTE. How can I tell them apart ?

Thanks in adavnce for the replies.

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Old 12-14-2005, 02:01 AM   #2
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You can easily tell the GEVO's from the past GE's. The GEVO's have bigger wings in the back and there are different things to tell them apart too but they're too small to really notice. As for the AC4400CW and the AC4400CW-CTE, there really isn't that much difference. I've seen them both but I can't see any differences, at least on the outside. I remember somebody telling me what CTE stood for but now I can't remember.
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Old 12-14-2005, 02:23 AM   #3
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I remember somebody telling me what CTE stood for but now I can't remember.
Controlled Tractive Effort.
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Old 12-14-2005, 02:47 AM   #4
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I just look at the rear vents. GEVOS have a huge square vents. 4400's don't.
GEVO
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ac44
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Old 12-14-2005, 03:32 AM   #5
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I think it's continuous tractive effort, actually.
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Old 12-14-2005, 04:10 AM   #6
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All diesel locomotives have continuous tractive effort, but you never hear an SD40 called an SD40CTE. CTE is controlled tractive effort. Here's what I found on it. Interstingly, it's not from GE's website.

From The Railroad Glossary

Controlled Tractive Effort. (CTE) A computer software package that gives the crew the ability to reduce the tractive effort of a locomotive for use in distributed power situations. The reduced tractive effort reduces the possibility of the helpers from pushing to hard and derailing the train.
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Old 12-14-2005, 04:27 PM   #7
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I can usually tell the CTE's from the others because of the GPS dome, but i suppose that may have to also do with the CTE computer package. The white dome is, it think the only way to tell, besides reading the name on the cab of the locomotive.
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Old 12-14-2005, 10:43 PM   #8
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I can tell a train is a GEVO by it's horn. Electronic bell is another way to tell it's a GEVO.
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Old 12-15-2005, 02:00 AM   #9
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Originally Posted by NicTrain35
Electronic bell is another way to tell it's a GEVO.
If thats the case then this is one good lookin Gevo!
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Old 12-15-2005, 02:05 AM   #10
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I mean telling the difference from an AC44 or an ES44AC. I do understand other engines have electronic bells.
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