Twin Peaks Tunnel

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The Twin Peaks Tunnel is a 2-mile (3.2 km) long subway tunnel in San Francisco, California, United States running under Twin Peaks. When it was opened on February 3, 1918, it was one of the longest subway tunnels in the world (Paris Métro's line 1, opened in 1900, beat it by a few miles, as did some of the London Underground lines). It was the longest subway tunnel west of New York City. It is still the world's longest streetcar tunnel. It runs from the intersection of Market Street at Castro Street in the east to the West Portal neighborhood in the west. There are two stations along the tunnel, Forest Hill Station, near the western end, and the now unused Eureka Station, near the eastern end.

When the Muni Metro system and Market Street Subway was built, it was connected to the Twin Peaks Tunnel to be used by the K Ingleside, L Taraval and M Ocean View lines. The Eureka Station was closed, and the metro lines stop at the nearby Castro Street Station instead. The original eastern entrance to the tunnel in the middle of Market Street at Castro was removed and new ones were placed on the side of the street further up the block, though no Metro or streetcar lines use them in regular service. (They are occasionally used in non-revenue service such as rerouting trains around construction projects.) A new station with high platforms, West Portal Station, was also built for the metro lines at the western end of the Twin Peaks Tunnel.

San Francisco Municipal Railway
Muni Metro	J Church • K Ingleside • L Taraval • M Ocean View • N Judah • S Castro Shuttle • T Third Street
Other Muni services	Cable cars • F Market streetcar • List of all Muni bus and rail lines
Muni Metro stations	Embarcadero • Montgomery • Powell • Civic Center • Van Ness • Church • Castro • Forest Hill • West Portal
Muni Metro system features	Market Street Subway • Twin Peaks Tunnel • Sunset Tunnel
Current projects	Third Street Light Rail Project • Central Subway • E Embarcadero streetcar
Connecting buses	AC Transit • Golden Gate Transit • SamTrans
Connecting rail services	Bay Area Rapid Transit • Caltrain
Other information	Rescue Muni • Key System