A former confederate soldier journeys to the transcontinental railroad to seek vengeance.

A looming railroad deadline throws Cullen and Lily together; Joseph and Elam deal with what their violent mission has wrought.

Following an attack by a bear, Elam struggles to survive in a Comanche village and find his way back to Cheyenne.

Cullen and Fong find themselves in peril as they transport a locomotive over the Sierra Nevada mountains. The Swede gains Phineas' trust.

Lily encounters natives in the wilderness. Cullen is questioned in regards to his recent actions against others. Meanwhile, Durant continues his push for political gain through his persuasions.

Cullen helps Elam track down a dangerous criminal; the town prepares to move down the tracks.

When Lily goes missing, Durant organizes a search party. A subsidiary request prevents Cullen from his continued search for the sergeant involved in the murder of his wife.

Cullen's search for the sergeant nears its end; Durant keeps to his hidden agenda while assisting in Lily's recuperation.

A bare-knuckle brouhaha between Elam and Cullen is spurred by Durant's latest attempt to deal with the railroad's financial crisis.

Durant challenges the Cheyenne to a competition in an effort to bring a halt to ongoing negotiations. Meanwhile, Elam and Cullen try to prevent bloodshed in town.

A tragedy leads Cullen to defuse an internal threat to the railroad.

Cullen and Mei escort precious cargo through the California wilderness; Eva nurses Louise back to health.

Chang discovers Mei's secret and forces her to flee Truckee. Meanwhile, Cullen's search for her brings new realizations while exorcising old demons.

Durant dispatches Cullen and Elam on a mission of vengeance. Lily struggles to find her place.

After a hard winter, Cullen and Elam travel to New York to secure their positions on the railroad as Durant fights for his legacy from prison.

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.

Cullen deals with trouble at home as he takes railroad matters into his own hands. Campbell makes a move against Durant and Mickey.

As the railroad prepares to leave Cheyenne behind in the Season 4 finale, Cullen returns to Fort Smith to retrieve his family.

Cullen makes a decision to ensure his family's safety. Campbell hires a new federal marshal to clean up the streets.

Cullen solves a Chinese labor strike in the wake of violence. Meanwhile, Durant pulls Mickey deeper into Union Pacific business.

Cullen faces life-changing decisions in Utah as Truckee adapts to life without him.

Mickey's dirty business with Durant leaves him with blood on his hands. Meanwhile, Campbell's return to town complicates Louise's life.

In the Season 1 finale, Cullen's past and future collide, impacting his life on the railroad.

In the Season 2 premiere, Durant and Lily steer the railroad further west, while Cullen and Elam land on opposite sides of the law.

Durant confronts a formidable threat to the rolling city, while a horrific crime leads Lily and Elam to join forces in order to attain justice.