The Greyhound Limited (1929)

A train engineer and his fireman are best friends, until the engineer breaks up a romance between his pal and a trampy girl he knows is no good for him, which also breaks up their friendship. The fireman's life starts to fall apart, and he is soon arrested for a murder he didn't commit, but is tried, convicted and sentenced to death. The engineer sets out to find the real killer and save his former friend from being executed.