Downtown Rail Extension (DTX) project

project awarded

The project involves the development of a Downtown Rail Extension (DTX) that will extend Caltrain commuter rail from its current terminus at Fourth and King Streets to the new Salesforce Transit Center and accommodate future California High-Speed Rail service.The 1.3-mile rail extension (1.95 miles of total construction length) will be constructed principally below grade using cut-and-cover and mined tunneling methods underneath Townsend and Second Streets. The project includes an underground station at Fourth and Townsend Streets, six structures for emergency exits, and ventilation along the alignment, utility relocation, and rail systems work.Fourth and Townsend Street StationThe new underground station at Fourth and Townsend Streets will serve Caltrain commuters. The station entrances along the north and south sides of Townsend Street will lead to two levels below grade: a concourse mezzanine and a train platform. The concourse will accommodate passenger amenities such as ticketing; maps and schedule information; and restrooms. It will also house mechanical and electrical rooms and Caltrain staff areas. The Train Platform will feature a center platform with one passing track on the south side.Transit Center Train StationThe two below-grade levels of the Transit Center, the Lower Concourse, and the Train Platform level will be built out and opened in Phase 2. The Lower Concourse will house rail ticketing, passenger waiting areas, and support spaces. At its east end, it will connect to the intercity bus terminal and a pedestrian tunnel leading to the Embarcadero BART/Muni station, approximately one block north of the Transit Center. Along with ticketing and passenger waiting areas for rail and support spaces, the Lower Concourse will contain retail space. The Train Platform will contain six tracks and three Caltrain commuter and high-speed rail service platforms. Back-of-house support spaces will also be built on the Train Platform level to support rail service.