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 Post subject: EMD GP7/9 and SD7/9 Information, Please.
PostPosted: Fri Mar 10, 2023 10:06 pm 

Joined: Sun Jun 16, 2019 7:31 am
Posts: 4
Not being a rivet counter myself, but occasionally finding myself in need of minutia, can anybody tell me if there are any dimensional differences between the short high hoods of EMD GP7/9 and SD7/9?


Last edited by wm 303 on Sat Mar 11, 2023 12:13 pm, edited 1 time in total.

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 Post subject: Re: Information, Please.
PostPosted: Sat Mar 11, 2023 12:06 pm 

Joined: Tue Jan 25, 2005 4:03 pm
Posts: 925
Would recommend editing the title of your post to include “EMD GP7/9 - SD 7/9 information?” to make it more likely to be noticed by someone with this area of insight.


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 Post subject: Re: EMD GP7/9 and SD7/9 Information, Please.
PostPosted: Sat Mar 11, 2023 1:37 pm 

Joined: Tue Sep 14, 2004 7:52 am
Posts: 2561
Location: Strasburg, PA
Not much different. SD7's and SD9's can be differentiated by the slightly different location of the class lights on either end. The few other details can be read about by looking up the specific models on Wikipedia.


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 Post subject: Re: EMD GP7/9 and SD7/9 Information, Please.
PostPosted: Sat Mar 11, 2023 3:36 pm 

Joined: Sun Sep 05, 2004 9:48 am
Posts: 1531
Location: Byers, Colorado
Having driven zillions of GP7s, GP9s, SD7s, and SD9s, I'd say the dimensions in question are the same... BUT, I don't have dimensioned drawings of these locomotive classes. There could be minute variations in size, and I'd never know the difference.

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Ask what you can do for your locomotive,

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 Post subject: Re: EMD GP7/9 and SD7/9 Information, Please.
PostPosted: Sat Mar 11, 2023 10:21 pm 

Joined: Fri Dec 22, 2017 6:47 pm
Posts: 1398
Location: Philadelphia, PA
I would suggest you get scale drawings of each and compare them.

Are you considering transplanting a SD short hood onto a GP, or vice-versa?

Phil Mulligan


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 Post subject: Re: EMD GP7/9 and SD7/9 Information, Please.
PostPosted: Sat Mar 11, 2023 11:40 pm 

Joined: Sun Jun 16, 2019 7:31 am
Posts: 4
Yes


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 Post subject: Re: EMD GP7/9 and SD7/9 Information, Please.
PostPosted: Sun Mar 12, 2023 8:57 am 

Joined: Thu Oct 08, 2015 11:54 am
Posts: 1773
Location: New Franklin, OH
If anyone on the board here as either of these models, a quick set of measurements would be helpful.

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Eric Schlentner
Turner of Wrenches, Drawer of Things


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 Post subject: Re: EMD GP7/9 and SD7/9 Information, Please.
PostPosted: Mon Mar 20, 2023 12:42 am 

Joined: Sat Jul 02, 2005 7:16 am
Posts: 1998
You might consider taking the applicable short hood GP and SD parts list and related drawings from EMD Parts Catalog 90 or the locomotive specification book to a photocopy place and having the scales matched up to allow a comparison.

The GP7 came out more than 2 years before the SD7 and on units that originally had steam generators the GP and SD hood door arrangements are not the same.

PC

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 Post subject: Re: EMD GP7/9 and SD7/9 Information, Please.
PostPosted: Fri Mar 24, 2023 4:37 pm 

Joined: Sun Jun 16, 2019 7:31 am
Posts: 4
A big "thank you" and a tip of my hat to Rypn Subscriber E.J. Berry for providing the exact information I was seeking.


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 Post subject: Re: EMD GP7/9 and SD7/9 Information, Please.
PostPosted: Fri Mar 24, 2023 4:52 pm 

Joined: Thu Oct 08, 2015 11:54 am
Posts: 1773
Location: New Franklin, OH
WOOT!

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Eric Schlentner
Turner of Wrenches, Drawer of Things


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