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What do the designations on locomotive models such as "M" "I" "X" etc. mean. I was looking at some BN GP40s which were rebuilt to be GP40Ms however I see no difference in the pictures. These are the said photos: http://archive.trainpix.com/BN/EMDORIG/GP40/3029.HTM and http://archive.trainpix.com/BN/EMDRBLD/GP40M/3507.HTM I was thinking of kitbashing a GP40 but I don't see what I would have to change besides the road numbers. This question does not apply to only the "M" but all those other extra letters. <br />Thanks, <br />Reed
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