The Hardest 100 Miles of the Transcontinental Railroad

In the 1860s, the Central Pacific Railroad had to push the first transcontinental railroad over the Sierra Nevada: seven thousand feet of climb, fifteen tunnels, and a summit tunnel cut through solid granite by crews advancing about a foot a day, through a winter of forty-four storms. This is how they did it: the shaft that turned one tunnel into four, the old locomotive hauled up the mountain to work as a hoist, the tunnels dug through snow, the nitroglycerin mixed on site, the miles of wooden snowsheds, and why so much of it is still standing. Most of the work was done by thousands of Chinese immigrant workers, whose own written record barely survives. 00:00 The paradox 00:44 The hardest hundred miles 01:36 A mountain built to stop railroads 04:47 Solid granite 08:03 The winter under the snow 12:38 A roof over the railroad 15:02 Why it is still standing Sources: John R. Gilliss, "Tunnels of the Pacific Railroad", Transactions of the American Society of Civil Engineers (1870). Stanford University, Chinese Railroad Workers in North America Project. Library of Congress, "1867 Sierra Strike". Linda Hall Library, "The Transcontinental Railroad" digital exhibition. American Society of Civil Engineers, Summit Tunnel landmark dedication (2025). Donner Summit Historical Society; Truckee-Donner Historical Society. Edson T. Strobridge, "The Central Pacific Railroad and the Legend of Cape Horn". This documentary uses AI-assisted narration and AI-generated or AI-enhanced visuals to illustrate historical engineering. The research, script, editing and final presentation were reviewed by the creator. Visuals are reconstructions, not archival photographs. Music (YouTube Audio Library): "At the Precipice of a Dying Light" by Dan Bodan "Final Girl" by Jeremy Blake "Your Suggestions" by Unicorn Heads #transcontinentalrailroad #engineering #history