VTA’s BART Silicon Valley Phase II: Tunnel Design & Rail Progress

VTA approves single-bore **tunnel** for BART Silicon Valley Phase II, accelerating design and construction of the 6-mile **rail** extension.

VTA’s BART Silicon Valley Phase II: Tunnel Design & Rail Progress
October 21, 2025 1:54 am
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Introduction

The Santa Clara Valley Transportation Authority (VTA) has confirmed a large single bore as the preferred tunnel configuration for the $12.7 billion Bay Area Rapid Transit (BART) Silicon Valley Phase II project. This decision allows VTA to move forward with the project design.

Project Configuration

The Santa Clara Valley Transportation Authority (VTA) board approved the single-bore tunnel configuration for the BART Silicon Valley Phase II project. This decision came after a peer review by tunneling and transit experts from transit agencies nationwide.

Project Scope

The VTA’s BART Silicon Valley Phase II Extension will add 6 miles and four stations to the BART system. The extension will connect from the Berryessa-North San Jose Station through downtown San Jose to Santa Clara. The project includes 5 miles of subway with underground station platforms at 28th Street-Little Portugal, downtown San Jose, and Diridon stations. A ground-level station will be located in Santa Clara. A train maintenance and storage facility will be co-located in San Jose and Santa Clara.

Next Steps

The board’s decision enables VTA to advance the project design to 60%. It also keeps the project on track for tunnel construction and the projected revenue service date, according to VTA officials.

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Conclusion

The Santa Clara Valley Transportation Authority (VTA) has approved the single-bore tunnel configuration for the BART Silicon Valley Phase II project. This allows the project to move forward with design and construction.

Company Summary

Santa Clara Valley Transportation Authority (VTA): The VTA is the public transit agency responsible for operating public transportation services in Santa Clara County, California.

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