Danger Lights

Louis Wolheim plays the boss of the railroad yard in Miles City, Montana. The film opens with a landslide across the tracks in Montana, and a repair crew is dispatched to clear the tracks. Several hobos are lounging nearby and are put to work helping the repair crew. One of the hobos, played by Robert Armstrong, is discovered to have been a former railroad engineer who lost his job due to insubordination. He is given a new job for the railroad by the yard boss, but quickly falls in love with the boss's fiancée, played by Jean Arthur.
Jealousy grows between the two over the affections of Arthur with both of them attempting to win her in marriage. Things come to a head during a fight in the railroad yard between the two, during which Wolheim is hit by a train and injured. To save his life, Armstrong must transport him in record time to Chicago for surgery.