ATTN: IB #NJudah & #TThird delayed at Embarcadero & Folsom due to a mechanical issue. Will update. (More: 16 in last 48 hours)

Central Subway Project
Project Introduction

The Central Subway Project will improve public transportation in San Francisco by extending the Muni Metro T Third Line through SoMa, Union Square and Chinatown. By providing a direct, rapid transit link between downtown and the existing T Third Line route on 3rd Street, the Central Subway will vastly improve transportation to and from some of the city's busiest, most densely populated areas.

When the Central Subway is completed, T Third Line trains will travel mostly underground from the 4th Street Caltrain Station to Chinatown, bypassing heavy traffic on congested 4th Street and Stockton Street. Four new stations will be built along the 1.7-mile alignment:

  • 4th and Brannan Station at 4th and Brannan streets (street level)
  • Yerba Buena/Moscone Station at 4th and Folsom streets (subway)
  • Union Square/Market Street Station on Stockton Street at Union Square (subway)
  • Chinatown Station at Stockton and Washington streets (subway)

Check out our video tour of the project alignment.

Additional Resources

Project Timeline 
2011 - Spring 2021
Revenue Service
Spring 2022
Project Status
Implementation / Construction
SFMTA Muni Metro train icon
SFMTA Muni bus icon
SFMTA bike icon
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Bus Routes and Rail Lines
Stockton Street, 4th Street

Office Hours

Have a question about the Central Subway Project?  Stop by our construction office to get assistance from project staff during our Community Drop-In Office Hours:

Central Subway Project Office
530 Bush St. Suite 400 (4th Floor)
M-F 9am to 5pm


The Central Subway Project is funded by the Federal Transit Administration (FTA), the State of California, the Metropolitan Transportation Commission, the San Francisco County Transportation Authority and the City and County of San Francisco.

The majority of funding for the Central Subway Project will be provided by the FTA’s New Starts program, with a total commitment over the life of the project of $948.4 million. An additional $41 million in federal funds is designated to the project as part of the U.S. Department of Transportation’s Congestion Mitigation and Air Quality Improvement Program, which supports environmental efforts for surface transportation and related projects. The federal funds allocated for the Central Subway Project cannot be redirected for investment in any other San Francisco projects.

The San Francisco Municipal Transportation Agency’s (SFMTA) baseline budget for the Central Subway Project remains at $1.578 billion. There has been no increase in the local funding commitment since original voter approval in 2003 of $126 million in Proposition B/K sales tax funds.

In total, about half of the funding for the entire Third Street Light Rail Transit Project is from federal sources, with the remaining half from state and local sources.  The Central Subway Project is one of the nation’s highest-rated projects in the FTA's New Starts program.

Project video(s)
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Contact Information
Charles Chan