"The San Francisco Muni Metro is a streetcar-like network which runs underground in the city centre with 8 underground stations. Along Market Street, the tunnel is shared by the Muni Metro (upper level) and BART (lower level). The western section of the tunnel between a point west of Castro station and West Portal, the so-called Twin Peaks Tunnel (3.5 km), was opened on 3 Feb 1918 with one underground station at Forest Hill." - UrbanRail.net
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