Right. Railroad Engineer -- not Mechanical Engineer. I inferred too much (and wrongly) from the imdb.com synopsis for The General. Probably given my affinity for mechanical engineers.
But the rest of it was right on: Number 37 on Premiere Magazine's list of 100 all time great movies. Unbelievably cool stunts and slapstick. Buster Keaton's favorite of his own films.
Best Railroad Movie ever made.