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Old 10-06-2020, 04:12 AM
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Kevin WS Kevin WS is offline
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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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