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

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

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