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Diderick - Should you decide to add variations on these to broaden the appeal, there are three basic locomotive models that can be made based on what's already been created. All have the same body size and shape, same fuel tank structure, and the same bogie/truck. The main visual differences are 1) the number and position of the radiator fans, 2) the length of the radiator, and 3) the use of a turbocharger or not (shown by the number of exhaust stacks).
Those are:
GP38 (the model you currently have): Two radiator fans, short radiator, and no turbocharger (shown by the two exhaust stacks, one in front and one in back of the dynamic brake fan).
GP39: Two radiator fans, short radiator, with turbocharger (shown by the single larger exhaust stack at the front of the engine compartment).
GP40: Three radiator fans, long radiator, with turbocharger (shown by the single larger exhaust stack at the front of the engine compartment).
All three can have dynamic brakes (or not), and can have varying sizes of fuel tank, depending on which railroad ordered them, but the basic structure of the frame, cab, and body is the same for all of them.
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