The fifth and final season of the AMC television series Hell on Wheels premiered on July 18, 2015 and comprised 14 episodes. This season, set in California and Laramie, Wyoming. It’s focused on the race to complete America’s First Transcontinental Railroad, as the union veteran Cullen Bohannan. He switched from working with the Union Pacific to the Central Pacific Railroad, upon the CP developer’s promise to help find Cullen’s family.