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American Experience
Summit Tunnel
In the fall of 1866, as the Central Pacific completed its track to Cisco, 92 miles east of Sacramento, Chinese work gangs were hurried to Donner Summit, where seven separate tunnels had to be dug. The most difficult was number six, the Summit Tunnel, 1,659 feet long and through some of the hardest rock in North America. Forty-four snow storms hit the summit that season.
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