The San Francisco Planning Department will be presenting the San Francisco Board of Supervisors with updated plans for getting trains from the Caltrain corridor into the lower level of the Transbay Transit Center.
The department has narrowed the choices down to four different options: maintaining the existing Caltrain alignment to Fourth and King and connecting to the originally planned Downtown Extension (DTX) to get to Transbay, tunneling under the existing alignment, shifting part of the alignment under Pennsylvania Avenue, or tunneling under Third Street out through Mission Bay.
