Cullen fights to save Hell on Wheels.

Durant files an injunction against Union Pacific, threatening Cullen's position; Elam deals with a dangerous newcomer.

Cullen and Durant meet with President Grant to discuss the future of the railroad; the Swede puts his plan against the Mormons in action.

Cullen's past catches up with him and threatens the fate of the railroad.

Cullen attempts to reconnect with Elam upon his return. Durant takes matters into his own hands while putting an old problem to rest.

Cullen, Durant, and Campbell try to negotiate a settlement on how the streets will be policed. An act of terror strikes Cheyenne.

The Swede's murderous rampage on the Hatch homestead results in a long overdue showdown with Cullen.

With General Grant's deadline only two days away, a gang of riders attacks Cheyenne while Cullen and Elam pay Durant a visit.

Cullen grapples with consequences while Elam mounts a rescue attempt. Durant receives Gen. Grant and the U.P. board in Cheyenne ahead of the deadline.

Cullen goes head to head with the new marshal to recover his arrested railroad workers. Campbell confronts Louise over a story.

Cullen grapples with Ruth's unexpected decision; Louise jeopardizes her reputation to fight for a story she believes in.

Cullen is in California with the Central Pacific Railroad, and must deal with the new workers.

Despite fighting to save his own life, Durant must try to keep the railroad from going under. Meanwhile, Cullen comes to the aid of an old comrade.

As Cullen plans an exit from Fort Smith, he challenges The Swede; when a new adversary arrives, Cheyenne feels his presence.

Cullens's family is at risk when a stranger arrives, stirring up old feelings; The Swede faces the consequences.

Cullen and Durant fight to save the life of a criminal. Meanwhile, Louise tries to provide support as Ruth copes with a great loss.

The race to finish the railroad comes down to inches, forcing all parties to contemplate the end of the line, and what the future holds for them.

With Elam's life in the balance, Cullen must decide how much he’s willing to risk. Meanwhile Durant faces financial ruin as Lily confronts the family of her late husband.

In the aftermath of tragedy, Lily and Cullen struggle to maintain order in Hell on Wheels. Meanwhile, Elam makes plans for the future.

Cullen prepares for battle while the town celebrates.

An unexpected roadblock forces Cullen to make a difficult choice as a reporter arrives in Hell on Wheels. Elam struggles with his new boss.

Cullen and Elam try to secure a new lumber source following a railroad accident; Durant tells Louise a secret about Cullen.

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.

Cullen contends with violence in Chinatown set off by disgruntled railroad workers. Meanwhile, the Swede manipulates Phineas in his plot against the Mormons.

Unexpected violence erupts in Chinatown during the festival of Tin Hau Don; Cullen confronts the Swede; and Durant involves Maggie in his latest scheme.