San Francisco Twin Peaks Tunnel work set to start

SFMTA photo

Work is scheduled to begin this week on a section of the Twin Peaks tunnel that connects downtown San Francisco to West Portal. In 2019, SFMTA completed a major project in the Twin Peaks tunnel with seismic upgrades, major track and other infrastructure overhauls.

Now, additional work in this section of trackway needs to be done to improve the quality of the system, reducing the potential for disruptions to service in the years to come. 

Construction crews will work inside the Twin Peaks Tunnel going into the tunnel via the entrance on Market Street between Diamond and Collingwood Street. Planned work includes the replacement of the overhead connectors, overhead lines, track fasteners, rails and track ballast, among other tasks

Work is planned for approximately three months, through February 2021. Crews will take a break for the holidays from Dec. 24 through New Year's Day. Construction is scheduled for Monday to Saturday, from 7:30 a.m. to 8 p.m. with hours are subject to change based on construction needs. No night work will occur in the public right of way and will be limited to inside the tunnel. 

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