1. The Elusive Eden
Cullen awaits the birth of his baby, laboring under The Swede's thumb at Fort Smith. Durant deals with the fallout from a railroad accident.
Hell on Wheels — Season 4
With Thomas "Doc" Durant back in control of the Union Pacific Railroad, civilization makes its way west to Cheyenne, Wyoming - the "Magic City of the Plains." Conflict between the government, ranchers, homesteaders, and the railroad arises as they compete for control of this newborn city that quickly became the most important railroad hub in the United States.
2. Escape from the Garden
As Cullen plans an exit from Fort Smith, he challenges The Swede; when a new adversary arrives, Cheyenne feels his presence.
3. Chicken Hill
Cullen goes back to work on the railroad and butts heads with his new boss. Durant and Campbell battle over a valuable piece of real estate.
4. Reckoning
Cullen deals with trouble at home as he takes railroad matters into his own hands. Campbell makes a move against Durant and Mickey.
5. Life's a Mystery
Cullens's family is at risk when a stranger arrives, stirring up old feelings; The Swede faces the consequences.
6. Bear Man
Following an attack by a bear, Elam struggles to survive in a Comanche village and find his way back to Cheyenne.
7. Elam Ferguson
Cullen attempts to reconnect with Elam upon his return. Durant takes matters into his own hands while putting an old problem to rest.
8. Under Color of Law
Cullen makes a decision to ensure his family's safety. Campbell hires a new federal marshal to clean up the streets.
9. Two Trains
Cullen goes head to head with the new marshal to recover his arrested railroad workers. Campbell confronts Louise over a story.
10. Return to Hell
Cullen, Durant, and Campbell try to negotiate a settlement on how the streets will be policed. An act of terror strikes Cheyenne.
11. Bleeding Kansas
Cullen and Durant fight to save the life of a criminal. Meanwhile, Louise tries to provide support as Ruth copes with a great loss.
12. Thirteen Steps
Cullen grapples with Ruth's unexpected decision; Louise jeopardizes her reputation to fight for a story she believes in.
13. Further West
As the railroad prepares to leave Cheyenne behind, Cullen returns to Fort Smith to retrieve his family.