Matt rides the busiest freight line anywhere, Union Pacific's Omaha to Sacramento — on a route that crosses the world's longest rail causeway, though the world's largest rail yard and over the fearsome Donner Pass, where Matt and the train crews must free the tracks from huge blocks of ice. The episode covers the building of the transcontinental railroad in the 1860s.
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Ready to Watch Extreme Trains, Season 1, Episode 8?