VTA Finishes BART Launch Shaft in San Jose
The 83-foot-deep shaft is ready for the boring machine as tunneling on the $12.7 billion extension nears.
Updated on Nov. 12, 2026 in Remote Work
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The Santa Clara Valley Transportation Authority completed excavation and reinforcement of an 83-foot-deep launch shaft for the Silicon Valley BART extension, a $12.7 billion project that will add four stations, three in San Jose and one in Santa Clara. The shaft sits on a former rail yard property near PayPal Park.
Why it matters
The shaft is the launch point for the boring machine that will dig the 5-mile tunnel, marking a step toward the project's next phase. The milestone comes after cost estimates more than doubled from $4.7 billion in 2014 and the opening date slipped from 2026 to 2037, issues that remain central to the project's progress for San Jose residents.
The project carries a $700 million funding gap after a federal grant shortfall, and VTA expects the Regional Transit Measure to generate about $1 billion annually. Whether the gap will be closed before tunneling is not addressed in the source.
The players
Santa Clara Valley Transportation Authority (VTA)
VTA is the public transit agency for Santa Clara County that oversees the Silicon Valley BART extension and has faced criticism from a county civil grand jury over its management of the project.
The details
Workers excavated and reinforced the 83-foot-deep hole, finishing excavation in September and completing concrete work for the underground structure in late October. The boring machine, 53 feet in diameter, will be positioned in the shaft before tunneling begins.
Timeline
2014: Original BART extension plans announced with a $4.7 billion estimate.
September 2026: Excavation at the launch shaft site completed.
Late October 2026: Concrete pouring for the underground structure completed.
Early 2028: Tunneling expected to begin.
Roadmap
Cost estimates for the extension have more than doubled since the $4.7 billion figure announced in 2014. The shaft milestone moves the project into tunneling preparation, though the opening date has already been pushed from 2026 to 2037.
The extension will add three new BART stations in San Jose and one in Santa Clara, giving commuters rail access once the line opens. The current opening date of 2037 means riders will need other options for many years.
The takeaway
Large infrastructure projects can change substantially in cost and schedule between approval and construction, so readers following local transit should track budget updates alongside construction milestones. The 2037 timeline is the figure to watch for when planning commutes.
What happens next
Tunneling on the 5-mile BART tunnel is expected to begin in early 2028, when the 53-foot boring machine starts excavating at 30 to 40 feet per day.
Further reading
For broader context on how regional transit projects shape commuting patterns, see Remote Work coverage for San Jose.
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