The project is nearly 20 years in the making and is expected to be completed in 2017. And because it is not just one tunnel, but two that are each one-way, the entire system required more than 151 kilometers of tunnel excavation, counting crossover tunnels, emergency stations, and other sections.
Seen here is the fork where trains can continue to head in the direction they were going, or switch to the crossover tunnel. That is expected to be done in cases of maintenance on one of the two one-way tunnels, or when there is an accident.
June 7, 2011 4:00 AM PDT
Photo by: Daniel Terdiman/CNET
| Caption by: Daniel Terdiman
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