Under Market St.

This photo is from a subway platform under Market St., downtown San Francisco.  It was taken early on a Saturday morning, a time when not many passengers were using the system.

The mammoth tunnel project that brought BART beneath center city provided a second transit level, above, for the San Francisco light rail network.  Each of the four  Market St. stations is also served by Muni, one level above.  A third, and highest, underground level provides separate entry areas for either system.

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