From LA TIMES: The bullet train will require about 20 miles of tunnels under the San Gabriel Mountains between Burbank and Palmdale, involving either a single tunnel of 13.8 miles or a series of shorter tunnels. As many as 16 additional miles of tunnels would stretch under the Tehachapi Mountains from Palmdale to Bakersfield. The state will probably opt for twin bores — one for each of two parallel tracks. That means as many as 72 miles of tunneling before 2022. Can it meet that schedule? "No way," said Leon Silver, a Caltech geologist and a leading expert on the San Gabriel Mountains. "The range is far more complex than anything those people know." http://www.latimes.com/local/california/la-me-bullet-train-cost-final-20151025-story.html
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AuthorGrant Johnson, registered Traffic Engineer, shares insights and experiences from around the world. Archives
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