Market Street Subway

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Not to be confused with the Market Street Subway in Philadelphia, which carries the SEPTA Market-Frankford Line and SEPTA Subway-Surface Trolley Lines.
Market Street Subway
Duboce subway exit.jpg
Duboce Portal at Duboce Avenue and Church Street
Type Rapid transit and
Light rail/Streetcar
Locale San Francisco, California
Termini Embarcadero Station
Castro Station
Stations 7
Opening BART: November 5, 1973
Muni Metro: February 18, 1980
Owner San Francisco Bay Area Rapid Transit District
San Francisco Municipal Transportation Agency
Operator(s) San Francisco Bay Area Rapid Transit District
San Francisco Municipal Railway
Character Underground subway tunnel
Track gauge BART:
5 ft 6 in (1,676 mm)
(Indian gauge)
Muni Metro:
4 ft 8 12 in (1,435 mm)
(standard gauge)
Electrification BART:
Third rail, 1000 V DC
Muni Metro:
Overhead lines, 600 V DC
Highest elevation underground
Route diagram

The Market Street Subway is a double-decker subway tunnel that carries Muni Metro and BART train traffic in San Francisco, California.[1][2] It runs under the length of Market Street between Embarcadero Station and Castro Street Station. The upper level is used by Muni Metro lines and the lower level is used by BART lines. BART does not run through the whole subway; it turns south and runs under Mission Street southwest of Civic Center Station. The northeastern end of the BART level is connected to the Transbay Tube. On the Muni Metro level, the southwestern end of the Market Street Subway connects to the much-older Twin Peaks Tunnel, and the northeastern end connects to surface tracks along the Embarcadero. The Embarcadero portal, which opened in 1998, is not an original part of the Market Street Subway – it is currently used by just the N Judah and the T Third Street lines.

Since the Muni Metro platforms at Montgomery Street, Powell Street, and Civic Center are long enough to hold two 75-foot (23 m) two-car trains simultaneously, the San Francisco Municipal Transportation Agency began double-berthing in April 2015.[3] Under this process, two trains are in the station at once: the rear train discharges passengers while the front train boards passengers. The new practice was aimed at reducing passenger frustration, though it would not reduce travel times.

The K Ingleside, L Taraval, M Ocean View, and T Third Street Muni Metro lines run through the entire length of the subway to its direct connection with the Twin Peaks Tunnel. The J Church and N Judah lines leave the subway via the Duboce portal at Church and Duboce streets.

Stations on the Market Street Subway[edit]

There are a total of seven stations in the tunnel. Four are used by BART, five by all Muni Metro lines, and two by four of the Metro lines:


  1. ^ Transit Rider Bay Area, California Muni
  2. ^ San Francisco Muni Metro
  3. ^ Rodriguez, Joe Fitzgerald (April 9, 2015). "Muni given go-ahead for double berthing at downtown stations". San Francisco Examiner. Retrieved 26 May 2015.