BTW did anyone else keep TCM on after "Wild Boys" to watch the next movie, Wellman's "Other Men's Women" or whatever it was called?? It was originally tested as "The Iron Road" or something like that, and was the story of an SP fireman who moves in with his engineer pal and ends up falling in love with the engineer's wife (who also falls in love with him). It had 2-3 times the railroad action in it than "Wild Boys" did, and had supporting roles played by very young Joan Blondell and James Cagney (as a fellow engineer).
There's a scene in it similar to the one mentioned in "Emperor of the North" where the train barely makes the siding in time...only in this one it doesn't and the engine clips off the corner of the caboose!! As best I could tell it wasn't done with models either...although the later scene of a bridge collapse was.
"Bound for Glory" starred David Carradine as folksinger / writer Woody Guthrie back in the mid 1970's. I recall a railroad scene where a train is going by a 1930's hobo camp...we don't see the engine, but the cars were 60' high cubes!!