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GE/EMD Loco Info/Specs Here For The Asking.
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   GE/EMD Loco Info/Specs Here For The Asking.
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   Author  Topic: GE/EMD Loco Info/Specs Here For The Asking.  (Read 4409 times)
RogerThornhill
TRAINing
Posts: 15
I have to ask what may be considered a dumb question
 
« Reply #40 on: Jul 4th, 2007, 5:50pm »
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But, I've read lots of info on locomotives, and one basic question I still don't know the answer to is;
 
What does "MAC" stand for?  For example, the SD90MAC has DC traction motors being run from rectified AC current from the alternator.  And I see that true AC locomotives with AC motors are labeled "AC", so what's with the MAC?  "Motified" AC or something?


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CHESSIEMIKE
Historian
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Posts: 4302
Re: I have to ask what may be considered a dumb question
 
« Reply #41 on: Jul 5th, 2007, 12:00am »
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on Jul 4th, 2007, 5:50pm, RogerThornhill wrote:       (Click here for original message)
But, I've read lots of info on locomotives, and one basic question I still don't know the answer to is;
 
What does "MAC" stand for?  For example, the SD90MAC has DC traction motors being run from rectified AC current from the alternator.  And I see that true AC locomotives with AC motors are labeled "AC", so what's with the MAC?  "Motified" AC or something?
The "M" is for "Modified". The designation was first used on some UP SD60s that were the first ones built with the North American Cab. At the time this was a modification from the then standard cab. My how times change.
CHESSIEMIKE


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Remember that a lone amateur built the Ark. A large group of professionals built the Titanic.
mattchew
TRAINing
Posts: 4
Re: GE/EMD Loco Info/Specs Here For The Asking.
 
« Reply #42 on: Oct 30th, 2007, 7:31pm »
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You wouldn't happen to have access to the wiring schematics for a GP 7 would you? I'm having trouble tracing down a problem. The unit I'm working on was rebuilt in 84 and converted to a 9. They rewired but left some of the old wiring, I have been getting a draw off my batteries and I trying to find the short. I know that the only two hot lines when the night switch is pulled should be the water dump and the radio, but wondered if it might be specific to this particular engine.
Matt


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CN Sparky
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Posts: 49
Re: GE/EMD Loco Info/Specs Here For The Asking.
 
« Reply #43 on: Mar 28th, 2008, 4:13pm »
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on Oct 30th, 2007, 7:31pm, mattchew wrote:       (Click here for original message)
You wouldn't happen to have access to the wiring schematics for a GP 7 would you? I'm having trouble tracing down a problem. The unit I'm working on was rebuilt in 84 and converted to a 9. They rewired but left some of the old wiring, I have been getting a draw off my batteries and I trying to find the short. I know that the only two hot lines when the night switch is pulled should be the water dump and the radio, but wondered if it might be specific to this particular engine.
Matt

 
I've got a plate of a GP7 on my work computer... still in need?


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