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The San Francisco Municipal Railway (Muni) is the public transit system for San Francisco, California. A part of the San Francisco Municipal Transportation Agency, it served 47.35 square miles (123 km2) with an operating budget of $659.5 million in 2013. Muni is the eighth-largest transit system in the United States, with 219,993,600 riders in 2012.
Muni began service on December 28, 1912, when the A Geary-Park line was inaugurated, running between the Financial District and the Richmond District on the western side of the city. Expansion of the system and consolidation with other transit companies eventually made Muni the city's sole public transit operator in 1952, when it acquired the bankrupt California Street Cable Railroad. Subsequent changes and adjustments to the system gave rise to the lines in use today.
The system consists of 84 routes serving the city and some parts of Daly City and Marin County. The names of all Muni routes, except those of cable car lines, have two parts: a number or letter and a street, neighborhood, or landmark, for example, the "1 California" route. The bus and trolley bus routes have number designations, the rail lines have letters, and the cable car lines are typically referred to only by name (Powell-Mason, Powell-Hyde, and California). However, Muni maps abbreviate the cable car line names to PM, PH and C, and they are given route numbers 59, 60, and 61, respectively, for use in Muni internal operations.
Rapid bus routes run through six major transit corridors through the city. These routes more or less follow the corresponding local bus route, but make only a few limited stops on their routes via bus-only lanes.
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