Season Three of “Hell On Wheels” ended with Cullen Bohannon (Anson Mount) married to a pregnant Naomi and living in the Mormon fort where the Swede (Christopher Heyerdahl) was impersonating church leader, Bishop Dutson; Thomas “Doc” Durant (Colm Meaney) back in control of the Union Pacific Railroad which had successfully expanded westward to Cheyenne; and Elam (Common), gravely injured by a bear while searching for the missing Cullen. As Season Four unfolds, civilization makes its way west with the railroad, bringing with it men who attempt to do with their pens what rougher men did in seasons past with their guns. Conflict between government and big business, ranchers, homesteaders and the railroad will continue to define the drama as all of those interests compete with one another for control of Cheyenne, Wyoming, the “Magic City of the Plains,” and the most important railroad hub in the country. The season will also introduce several new characters including John Campbell (Jake Weber, “Medium,” “The Following”).