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Twin Peaks Tunnel Work to Start November 30 By View from inside the Twin Peaks Tunnel that was first opened 102 years ago in 1918  The Eureka Curve is a section of the Twin Peaks tunnel that connects downtown San Francisco to West Portal and beyond. In 2019, we completed a major project in the Twin Peaks tunnel with seismic upgrades, major track and other infrastructure overhauls. Now, additional work in this crucial section of trackway needs to be done, and we will start that on Monday, November 30. This work is essential to improving the quality of the system and reducing the potential for disruptions to service in the years to come.  Starting the Monday after Thanksgiving, construction crews will begin maintenance work inside the Twin Peaks Tunnel going into the tunnel via the entrance on Market Street between Diamond and Collingwood Street. Planned work includes replace...