The F Market & Wharves line is one of several light rail lines in San Francisco. Unlike the other lines, the F line is operated as a heritage streetcar service, using exclusively historic equipment both from San Francisco's retired fleet as well as from cities around the world. While the F line is operated by the San Francisco Municipal Railway (Muni), its operation is supported by Market Street Railway, a nonprofit organization of streetcar enthusiasts which raises funds and helps to restore vintage streetcars.
Despite its heritage status, the F Market & Wharves line is an integral part of Muni's intermodal urban transport network, operating at frequent intervals for 20 hours a day, seven days a week. It carries local commuters and tourists alike, linking residential, business and leisure oriented areas of the city. Unlike the San Francisco cable car system, standard Muni fares are levied.