Also, you have the F-Market and Wharves line too which continues from the Ferry Building along the Market Street up to the Castro.
Henceforth, the streetcars are offering a new E-Embarcadero line. This line goes from the south on the Embarcadero up to the Caltrain Station.
In addition, we can see that the Muni Metro lines are operating in the tunnel below the Market Street.
Keep in mind that Muni operates on the first level of the tunnel, whereas BART operates on the second level.
Bay Area Rapid Transit- BART
To continue with the Bay Area Rapid Transit- the BART!
Generally speaking, BART is operating on the second level of the tunnel. It connects the East Bay with parts of the Peninsula, altogether with 46 station locations. BART is additionally developing 5 new locations, which are currently under construction.