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 San Francisco itself were converted to buses after World War II, five lines survived until the 1970s, when the streetcar lines were converted to light rail during the opening of the Market Street Subway in 1980. Recently, the system had 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.
The 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, twenty-four surface stations, and numerous surface stops. Muni Metro utilizes a fleet of 151 light rail vehicles (LRV) made by Breda.
MUNI metro map. Click to download full size.