Union Pacific is a 1939 American dramatic western film directed by Cecil B. DeMille, and starring Barbara Stanwyck and Joel McCrea. Based on the novel Trouble Shooter by Western fiction author Ernest Haycox, the film is about the building of the railroad across the American West. The 1862 Pacific Railroad Act signed by President Lincoln authorizes pushing the Union Pacific Railroad westward across the wilderness toward California, but financial opportunist Asa Barrows hopes to profit from obstructing it. Chief troubleshooter Jeff Butler has his hands full fighting Barrows' agent, gambler Sid Campeau. Campeau's partner Dick Allen is Jeff's war buddy and rival suitor for engineer's daughter Molly Monahan. Who will survive the effort to push the railroad through at any cost? Union Pacific was released in 1939 two months after John Ford's Stagecoach, which film historians consider responsible for transforming the Hollywood Western from "a mostly low budget, B film affair." Wheeler M.