Turning 100 years old in 2018, Twin Peaks Tunnel needs extensive work to its interior to continue to operate safety and reliably for years to come. 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. Twin Peaks Tunnel is currently under a speed restriction, which slows down trains as they travel through. Replacing the tracks will lift the speed restriction and allow trains to move faster through the tunnel and speed up travel times. Seismic reinforcements will better protect the tunnel's overall structure and stability.
The 1917 footage of the Twin Peaks Tunnel featured in this video was restored by the Niles Silent Film Museum. Many thanks to them, and to the Internet Archive and Prelinger Archives, for their work to preserve and share this rare and historic film.
More info: sfmta.com/twinpeaks