I've noticed with the first issue of the SD60 (1999/2000 I believe) Lionel has it listed as an SD60MAC. Never really paid much attention to it. It's offered on the same page as a few SD70MAC's. On the real ones, the engines are almost identical except there's a difference in the trucks and the frame is slightly shorter on the SD60. I own two of the Lionel SD70MAC's but still haven't been able to get my hands on an SD60. Now, if I'm correct in what I've seen just looking at pictures, it appears they used the exact same tooling for the frame and long hood, just changed the cab. Can anyone with both of these engines confirm that? I know on the SD70MAC the frame has support for around the inside of the nose, so the frame on the SD60 might be different in that area because of the standard cab. It'd be cool to know if they have interchangeable shell parts, it could make for some interesting custom engines with minimal/no work at all.
Trevor