Twin Peaks Tunnel Inspection Project
As part of an ongoing Twin Peaks Tunnel Inspection Project, SFMTA will complete a detailed structural inspection of the over two-mile-long Twin Peaks Tunnel. The inspection will require close up, in-person visual inspection as well as non-destructive testing.
This work requires significant preparation including de-energization of the overhead lines, shutdown of the track, staging of tools and equipment, mobilization of trackside equipment, and up-close inspection of the tunnel ceiling that is will be performed during non-revenue hours. Multiple teams will work around the clock to complete the work. Further inspections will be scheduled at a later date and may also require service changes.
Details
Transit Service Plan
- Forest Hill and West Portal stations will be closed. They will be served by K, L and M buses on the surface, which will also serve Castro and Church Stations.
- K Bus and M Bus will run between Church Station and Balboa Park Station.
- L Bus will run between Church Station and the Zoo.
- S Shuttle trains will run between Castro Station and Embarcadero Station.
- Customers traveling further west will transfer to the K, L or M Bus at Church or Castro Station.
- J Church and N Judah service will operate as usual. Customers traveling downtown can board the J and N trains at Church & Duboce or a Shuttle train at Church Station.
- Next Muni predictions will be operating to provide arrival information to customers.
Thank you for your support and understanding while we enhance and protect the tunnel's overall structure and stability.