The Task Ahead
Clip: Season 15 | 1m 5s
Engineer Theodore Judah solved the great riddle of the Pacific Railroad when he reached Donner Pass. Judah immediately recognized the location as ideal for constructing a line through the Sierra Nevada. Judah's plans called for bridging rivers and ravines, carving 20-foot wide shelves out of sheer mountain faces and driving 18 tunnels -- one more than a 1000 feet long -- through solid granite.