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Old 10-05-2020, 07:22 AM
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Diderick A. den Bakker Diderick A. den Bakker is offline
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GP-38 - drawings etc. needed!

Now that the Santa Fé sleeper (Paper Trade) is nearing completion, designer Cor van Haasteren is speeding up work on the Douglas DC-4. After that, we are planning a period of rest - but the GP-38 is next on our list. We rather like the idea of re-using the trucks of the F7!
We often get very useful information - but often rather late in the design process. I hope to prevent that by asking you all to search your computers, magazines etc. for any drawings and other useful information.
It is often difficult to find pictures, or even drawings, of top and bottom of a locomotive. Hint, hint!
Looking forward - just the GP-38, not the GP-40!
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GP-38 - drawings etc. needed!-web-2011-6-alaska-1-963.jpg  
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Old 10-05-2020, 07:59 AM
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Here are some Diderick.

To start the replies off, a whole heap of drawings, including tops and bottoms.

https://www.google.com/search?q=gp38...4CilC7fWFaXmUM
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Old 10-05-2020, 04:04 PM
jyduchene jyduchene is offline
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I have to say that I have not been this excited about a new model in a long time. Have just the spot for it. I have the F7 but I am daunted by the complex folds of the nose. The GP 38 I think will be more manageable for us mortals

So looking forward to this.

John
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Old 10-05-2020, 09:15 PM
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Umm...

You do realize that the photo you posted is of a GP40-2, don't you?
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Old 10-06-2020, 02:12 AM
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Quote:
Originally Posted by jyduchene View Post
I have to say that I have not been this excited about a new model in a long time. Have just the spot for it. I have the F7 but I am daunted by the complex folds of the nose. The GP 38 I think will be more manageable for us mortals

So looking forward to this.

John
Tip for the nose, as for any other complex parts: make a few extra copies and start experimenting! That has always worked for me!
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Old 10-06-2020, 02:26 AM
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Originally Posted by sgoti View Post
Umm...

You do realize that the photo you posted is of a GP40-2, don't you?
You confuse me - I have just checked more pictures of this locomotive (same number), including those I made myself during a trip in Alaska, 2011.
The picture below does indeed say GP-40 - but I thought the GP-40 had six axles, not four like the one in the picture?! I took that to be the decisive difference between the two types!? Please enlighten me!
Attached Thumbnails
GP-38 - drawings etc. needed!-web-2011-6-alaska-1-962.jpg  
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Old 10-06-2020, 04:12 AM
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Both the 38's and 40's are 4 axle locomotives.

The main diffence visually is that the GP38-2 has three fans (dynamic brake X 1, engine x 2). The GP40-2 has four fans (dynamic brake X 1, engine x 3).
The GP-40's also have a turbo-exhaust stack.

So looking at the roofline is the easiest method. Note other devices on the roof vary - there are oil baths, paper filter boxes and all sort of other things that vary wildly.

The best way to really learn the difference are to look at pictures of model railway locomotives!

Note also that the length of the locos are the same for GP38, GP38-2, GP38-2W GP39, GP39-2, GP40, GP40-2, GP40-2W, GP50, GP59 and GP60. They are all fifty nine feet and a couple of inches long!
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Old 10-06-2020, 04:47 AM
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Quote:
Originally Posted by Kevin WS View Post
Both the 38's and 40's are 4 axle locomotives.

The main diffence visually is that the GP38-2 has three fans (dynamic brake X 1, engine x 2). The GP40-2 has four fans (dynamic brake X 1, engine x 3).
The GP-40's also have a turbo-exhaust stack.

So looking at the roofline is the easiest method. Note other devices on the roof vary - there are oil baths, paper filter boxes and all sort of other things that vary wildly.

The best way to really learn the difference are to look at pictures of model railway locomotives!

Note also that the length of the locos are the same for GP38, GP38-2, GP38-2W GP39, GP39-2, GP40, GP40-2, GP40-2W, GP50, GP59 and GP60. They are all fifty nine feet and a couple of inches long!
Thank you, Kevin, that helps. So we will make that choice later. Another question - is the space between the trucks just one large tank, so in fact a flat bottom?
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Old 10-06-2020, 04:57 AM
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Quote:
Originally Posted by Diderick A. den Bakker View Post
You confuse me - I have just checked more pictures of this locomotive (same number), including those I made myself during a trip in Alaska, 2011.
The picture below does indeed say GP-40 - but I thought the GP-40 had six axles, not four like the one in the picture?! I took that to be the decisive difference between the two types!? Please enlighten me!
The confusion is not from me.

GP (General Purpose) locomotives were all four-axle models.

SD (Special Duty) locomotives were all six-axle models.
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Old 10-06-2020, 05:21 AM
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Originally Posted by Kevin WS View Post
Note also that the length of the locos are the same for GP38, GP38-2, GP38-2W GP39, GP39-2, GP40, GP40-2, GP40-2W, GP50, GP59 and GP60. They are all fifty nine feet and a couple of inches long!
I will need to check my sources later when I have time, but it has been my understanding that the GP59 and GP60 were slightly longer by a few inches. This may have been due to the (at the time) new 710 model engine (versus the 645 that was in all the other models).

Also, one should note that ARR #3011, as pictured by Diederick, has been heavily modified from its original appearance and is not an example of a "typical" GP40.
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