Bay Area Rapid Transit’s Board of Directors has approved construction of a 4.7-mile single-bore tunnel as part of the $4.8-billion second phase of a program to extend service to Santa Clara County’s Silicon Valley. BART claims the approach, the first use of a single-bore tunnel for a U.S. passenger rail project, will save 10 months of construction, compared with a twin-tunnel design, and minimize surface disruptions in downtown San Jose. Pending federal funding approval, work on the six-mile segment between the end of the extension’s first phase and the Norman Y. Mineta San Jose International Airport is set to get underway within the next two years.
BART To Break New Ground With Extension Tunnel
May 2, 2018