The fourth season of the AMC television series Hell on Wheels premiered on August 2, 2014, and will consist of 13 episodes. This season continues to focus on the westward expansion of the Union Pacific Railroad. Conflict between the government and businesses, ranchers, homesteaders and the railroad will also arise, as all of those interests compete with one another for control of Cheyenne, Wyoming, the most important railroad hub in 1867.

ep1:At Fort Smith, Cullen Bohannon tells Aaron Hatch that he will remain there until Naomi gives birth to the baby. He also warns him of the bishop, whom he knows is the Swede. After the baby is born, the Swede refuses Cullen's departure when Cullen states he is taking Naomi and baby William with him. In Cheyenne, Wyoming, Thomas Durant tries to maintain control of both the town and the railroad after a disaster occurs. He also awaits the arrival of the newly appointed governor, John Campbell. Meanwhile, Eva tries to cope with being without both Elam and her child by doing chores for the brothel.