HeadsUp: Protest/march activity is beginning on Market St. near Steuart. At this time, minor delays are expected in the area, but no reroutes are being implemented at this time. Personnel are on scene monitoring. Will update as more information becomes available. (More: 10 in last 48 hours)

VIDEO: Take a Tour of the Construction Inside the Twin Peaks Tunnel

By
Erica Kato
Tuesday, July 24, 2018

Crews working on the Twin Peaks Tunnel construction.

We are now halfway through the project and on track to finish on schedule. We want to thank the residents, merchants, and riders for their patience as we complete much-needed upgrades to the century-old Twin Peaks Tunnel. With 100 years of service under its belt, the Twin Peaks Tunnel needs extensive work to its interior to continue to operate safely and reliably for years to come.

Twin Peaks Tunnel track and drainage work.

The tunnel's infrastructure, including the tracks, walls and drainage systems, must be maintained in a timely manner to keep up with the demands of the Muni system.

SFMTA crews getting a tour of the Twin Peaks Tunnel improvements.

Take your own tour with this video and photo round-up of the progress and advancement of the project. Be sure to check out previous blog posts we’ve done on the history of the tunnel, and check out the Rider Guide when trip planning.

An inside look at the Twin Peaks Tunnel improvements.