page_title: Muni Metro
section_title: Infrastructure
hierarchical_section_title: Muni Metro / Infrastructure
caption_attribution_description: English: Market Street Subway just east of Castro Street Station, showing the pair of crossovers
context_page_description: The Muni Metro is a light rail system serving San Francisco, California, United States, operated by the San Francisco Municipal Railway, a division of the San Francisco Municipal Transportation Agency. With an average weekday ridership of 157,700 passengers as of the fourth quarter of 2019, Muni Metro is the United States' second busiest light rail system. Muni Metro operates a fleet of 151 Breda light rail vehicles, which are being supplemented and replaced by Siemens S200 SF LRVs.
  Muni Metro is the modern incarnation of the traditional streetcar system that had served San Francisco since the late 19th century. While many streetcar lines in other cities, and even in San Francisco itself, were converted to buses after World War II, five lines survived until the early 1980s, when they were rerouted into the newly built Market Street subway. The system today traverses a number of different types of rights of way, including tunnels, reserved surface trackage with at-grade street crossings, and streetcar sections operating in mixed traffic; surface stops range from high-platform stations to traditional curbside streetcar stops.
context_section_description: The Muni Metro system consists of 71.5 miles (115.1 km) of standard gauge track, seven light rail lines (six regular lines and one peak-hour line), three tunnels, nine subway stations, 24 surface stations, and 87 surface stops.
  The backbone of the system is formed by two interconnected subway tunnels, the older Twin Peaks Tunnel and the newer Market Street subway, both controlled by automatic train operation systems to run trains with the operators closing the door to allow the train to pull out of a station. This ATO system was upgraded in 2015 to replace outdated software and relays. The tunnels, 5.5 miles (8.9 km) in total length, run from West Portal Station in the southwestern part of the city to Embarcadero Station in the heart of the Financial District. Three lines—the K Ingleside, the L Taraval, and the M Ocean View—feed into the tunnel at West Portal, while two lines, the J Church and N Judah, enter at a portal near Church Street and Duboce Avenue in the Duboce Triangle neighborhood. Two lines, the N Judah and T Third Street, enter and exit the tunnel at Embarcadero. An additional tunnel, the Sunset Tunnel, is located near the Duboce portal and is served by the N.
  The interconnected tunnels contain nine subway stations. Three stations—West Portal, Forest Hill and the now-defunct Eureka Valley—were opened in 1918 as part of the Twin Peaks Tunnel, while the other seven—Castro Street, Church Street, Van Ness, Civic Center, Powell Street, Montgomery Street and Embarcadero—were opened in 1980 as part of the Market Street subway. Four stations, Civic Center, Powell Street, Montgomery Street, and Embarcadero, are shared with Bay Area Rapid Transit (BART), with Muni Metro on the upper level and BART on the lower one.
  Above ground, there are twenty-four surface platform stations. Two stations, Stonestown and San Francisco State University are located at the southwestern part of the city, while the rest are located on the eastern side of the city, where the system underwent recent expansion as part of the Embarcadero extension and the Third Street Light Rail Project. However, many of the stops on the system are surface stops consisting of anything from a traffic island to a yellow-banded "Car Stop" sign painted on a utility pole.
  All subway and surface stations are handicap-accessible. In addition, several surface street stops are also handicap-accessible, often consisting of a ramp leading up to a small platform for boarding.
  In Muni Metro terminology, an inbound train is one that heads from the western neighborhoods and West Portal towards Embarcadero, while an outbound train travels in the opposite direction out of downtown towards the west. Even the T Third Street line is consistent with this terminology, with an inbound train going from West Portal through Embarcadero to Sunnydale, and an outbound train running out of the southeastern neighborhoods into downtown.
  Muni Metro has two rail yards for storage and maintenance:
  Green Yard or Curtis E. Green Light Rail Center at 425 Geneva Avenue is located adjacent to Balboa Park Station and serves as the outbound terminus for the J Church, K Ingleside, and M Ocean View. The facility has repair facilities, an outdoor storage yard and larger carhouse structure. The facility was renamed for former and late head of Muni in 1987.
  Muni Metro East is a newer facility opened in 2008 and is located along the Central Waterfront on Illinois and 25th Streets in the Potrero Hill neighborhood, a block from the T Third Street line. The 180,000-square-foot (17,000 m²) maintenance facility with outdoor storage area is located next to Northern Container Terminal and former Army Pier.
caption: Eastern portion of Twin Peaks Tunnel
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