10. 61 Degrees

After spending the night together, Cullen and Mei (as Fong) return to work on the railroad. There is tunnel work to be done, and Cullen suggests using nitroglycerin to do the blasting. James Strobridge teaches the Chinese how to make blasting caps. In Laramie, Durant proposes marriage to Maggie, who says she'll never remarry but will stay with him, if Durant promises no more schemes. They must then deal with an angry mob wanting payment. Durant and Mickey later plot a fake kidnapping to get $250,000 ransom money from the railroad board; Durant will pay Mickey $25,000 for organizing it.

Mickey has Shea lead the kidnapping, which goes awry when Shea kills the chief engineer, and then nearly kills Louise, until Durant speaks up. Following the death of a tunnel worker mishandling the nitroglycerine, Cullen suggests they continue to use the explosive, but that he and James will clear future blasts. James refuses to participate and is fired from the railroad. The tunnel is later completed, and Chang becomes suspicious when he catches Cullen exiting Fong's tent.