Cullen enlists new workers to help him move a locomotive on a sled; Cullen and Fong must work together; Swede and Phineas fight for survival after being banished to the high country.
Cullen enlists a crew of Chinese workers to help him move a locomotive from Truckee to the Summit Tunnel on a sled. An accident forces Cullen and Fong to work together to survive. Swede and Phineas fight for survival after Cullen banishes them to the high country on snow-shoveling patrol.