In the section that BART does run in, there are tunnels on two levels for most of the length of the tunnel, the upper level is used by Muni Metro lines and the lower level is used by BART lines.
There are tunnels on two levels for most of the length of the tunnel. BART does run in. This is in the section this. The upper level is used by Muni Metro lines. BART does run in. This was in the section this. The lower level is used by BART lines. BART does run in. This was in the section this.