Twin Peaks Tunnel

The Twin Peaks Tunnel is a 2.27-mile-long (3.65 km) light rail/streetcar tunnel in San Francisco, California. The tunnel runs under Twin Peaks and is used by the K Ingleside, L Taraval, M Ocean View and S Shuttle lines of the Muni Metro system. The eastern entrance to the tunnel is located at the west end of the Market Street subway, near the intersection of Market and Castro Streets, in the Castro neighborhood, and the western entrance is located at West Portal Avenue and Ulloa Street, in the West Portal neighborhood, named for the tunnel. There are three stations along the tunnel: West Portal at the western entrance, Forest Hill near the middle, and the now disused Eureka Valley near the eastern end.

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Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).

Other tunnels in United States

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