Top Definition
The most bad-ass locomotive built by Electro Motive Division of General Motors ever. Only 30 were built, only for Conrail. Even after getting split between CSX and Norfolk Southern, SD80MAC's remain awesome. Foamers often faint at the mere sight of one.
Foamer 1 "Dude, did you see Q390? It had a fucking SD80MAC leading in perfect sunlight!"

Foamer 2 "I know, I think I came in my pants"
by CR_J February 15, 2010

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