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The class light housings are raised on the front of the he ex GO units and I believe they have dual rear headlights versus single on CN units.
Class lights and dual beam headlight on the back (longhood end)
They’re lower than the original CN GP40-2Ws also… if I recall correctly I think it’s because they have a lighter / thinner frame. Mr. Mercer can confirm (if he sees this).
It’s important to note that the “W” was a railfan addition and not an official GMD designation (there was no official special GMD designation for those Canadian Safety Cab units) but it does add clarity to the models. That said:
CN 9400-9632 = model GP40-2L(W), that used a special frame (hence the L) with taller frame members, so appear to sit higher. They also have the standard large 3000 gal. fuel tank.
CN 9633-9667 (bought new), and 9668-9678 (ex-GO) = GP40-2(W), built with the standard GP40-2 frame but smaller 2300 gal. fuel tanks.
A few articles state that the Canadian Safety Cab added extra weight to the GP40-2 design, so in order to keep the fully-loaded unit weight down around 263k lbs (and presumably keep the same fuel capacity) a lighter-weight frame was used that featured taller frame members. The GO units and later CN units had standard frames, but had smaller fuel tanks so the weight was still kept down.
Thank you for the explanations all.