So I just brought up an interesting idea, lets see which wins out. Which Locomotive series has the MOST variations!? I brought up the EMD 70 series, and EMD 40 series. We're only talking original builds, not rebuilt units (I.E. the SD40 rebuilds, of BB40-2's) 70 Series: SD70M, SD70I, SD70M Tier I, SD70M Tier 1 Phase II cab equipped, SD75M, SD75I, SD70MAC, SD70ACe, SD70M-2. 40 Series: SD40, SDP40, SD40X, SD40A, SD40-2 early, SD40-2 mid, SD40-2 late, SD40-2 Canadian (straight steps), SD40-2 high nose, SD40-2 snoot 108", SD40-2 snoot 116" SD40-2 snoot 123", SD40T-2, SD40T-2 snoot 116", SDF40-2, SD40-2F, SD40-2W and SD40-2S (SD40-2SS/SD40SS). So far it looks like the 40 series wins, anyone?