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I am designing an "imagineered" locomotive (for eventually modelling in Blender)and have a question--if one were to add a fully-enclosed "vestibule" or "all-weather" cab to a locomotive, without changing anything else, how does this affect the engine's (and tender's) weight? I have tried looking at various examples (NP's A3 vs. A4, SP's GS3 vs. GS4), but since more than just the cab had changed between the successive classes, I'd like to know the approximate difference if just the cab--and nothing else--changed.
Can anyone help me out?
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