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What is a GP40M. I always understood that the "M" in EMD designations stands for modified and refers to a comfort cab, but this type does not have one. So what does the M stand for in this model?
I'm interested in modeling such a unit sometime, and I need to know what kind of physics I should use. Which would be closer? the GP40 pyisics (provided in the Version 4.5 physics folder), or the GP40-2 physics.