The 1862 Pacific Railroad Act signed by Abraham 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?