The machine will take three to four years to dig a nearly five-mile-long, 54-foot in diameter tunnel.
The Santa Clara Valley Transportation Authority is all in on its plans to build a roughly five-mile long tunnel under downtown San Jose and Santa Clara for its Silicon Valley BART extension after officials announced this week it had purchased a $76 million tunnel boring machine.
The six-mile BART extension will connect the Berryessa Transit Center in north San Jose to downtown and Santa Clara with four stops and could carry more than 50,000 passengers on weekdays to other parts of the Bay Area by 2040, according to VTA estimates. VTA estimates the tunnel boring machine will take approximately three to four years to dig the five-mile-long, nearly 54-foot in diameter tunnel that is expected to be the largest single bore transit tunnel in the world. The machine, which has been, will be capable of digging 30 to 40 feet a day and will be extracted on the east side of Highway 101 near Las Plumas Avenue.
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