The Muni Metro is a light rail system serving San Francisco, California, United States, operated by the San Francisco Municipal Railway (Muni), a division of the San Francisco Municipal Transportation Agency (SFMTA). 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 (LRVs), 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. Recently, the system has undergone expansion, most notably the Third Street Light Rail Project, completed in 2007, which started the first new rail line in San Francisco in over half a century. Other projects, such as the Central Subway, are underway.
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