NEW:  Twin Peaks Tunnel Improvements Weekend Early Closures

Friday, March 16 through Sunday, March 18: Starting late night Friday and Saturday, and continuing for up to 15 weekends, preparatory work inside Twin Peaks Tunnel will be completed in the early morning weekend hours. To accommodate this work, some stations will be closed early over the weekend:

  • Forest Hill and West Portal stations will be closed at 9 p.m. on Fridays and at 11 p.m. on Saturday nights.  Stations will reopen the following morning for regular train service.  Signage will be posted at the temporary bus stop to denote the K, L and M shuttle stop.
  • Castro Station will remain open to trains and become the terminal for S Shuttle and T Third trains that are running.  Regular service will return the following mornings.

Buses will operate for K Ingleside, L Taraval and M Ocean View lines, running between Embarcadero Station and each line’s outbound terminal. Buses will run every 20 minutes. Owl service will begin at its regular time. There will be no changes to N Judah, J Church or T Third service.

This preparatory work is being done ahead of the Twin Peaks Tunnel summer closure. In the summer, 100-year-old Twin Peaks Tunnel will be closed for up to 60 consecutive days in order to replace aging tracks and complete major tunnel improvements.

For more information about the Twin Peaks Tunnel Improvement Project, visit