FINAL UPDATE: IB #FMarket cleared at Market and Van Ness. Regular service resuming. Expect residual delays. (More: 25 in last 48 hours)

Twin Peaks Tunnel Work Starting This Weekend

Tuesday, March 13, 2018

Men working on the Twin Peaks tunnel.

With over one hundred years of service under its belt, Twin Peaks Tunnel will undergo much-needed improvements later this summer.  To make sure the tunnel and materials are ready for the summer construction, crews will be completing preparatory work at night on weekends. This prep work will help us stick to our tight summer schedule and give us a vital head start on the project.

Starting Friday, March 16, until Sunday, June 17, Forest Hill and West Portal stations will close early on Friday and Saturday nights. The next 14 weekends will be used for prep work. While we’re working in the tunnel, train service for the K Ingleside, M Ocean View and L Taraval lines will be disrupted. Two stations will be closed, and other train lines will run modified service.

Here’s how service will run during the early closures:

  • Forest Hill and West Portal stations will close early, at 9pm on Friday nights and 11pm on Saturday nights. All stations will reopen the next morning for regular train service.
  • Bus substitutions will operate for the KLM lines between Embarcadero and each line’s outbound terminal destination. Buses will run every 20 minutes.
  • Board all buses at Muni Metro Shuttle route stops—located on island stops on Market Street, or look for the yellow half-moon signs that say “Muni Metro Shuttle.”
  • Customers heading to Castro Station or Church Station can board S Shuttle or T Third trains. Both S and T lines will turn around at Castro and head towards downtown.
  • KLM buses will run until Owl service starts regular service.

A Metro Shuttle stop sign.

This summer, Twin Peaks Tunnel will undergo major improvements to keep the tunnel running safely and reliably for more years to come. Construction will be completed during a single closure lasting up to 60 days. Improvements include replacing tracks and its infrastructure, replacing a 100+ year old drainage system, completing seismic retrofits to the eastern end of the tunnel and adding additional cross-over tracks to improve operating functions.

For more information, visit the Twin Peaks Tunnel Improvement Project page.