*** Welcome to piglix ***

Downtown Rail Extension

Downtown Extension
Overview
Type Railroad
System Caltrain Caltrain
California High Speed Rail.svg CHSR
Status Planned
Locale San Francisco, California
Stations 1
Operation
Owner Peninsula Corridor Joint Powers Board (PCJPB)
Operator(s) PCJBP; California High-Speed Rail Authority
Character Underground railway tunnel
Technical
Line length 1.3 mi (2.09 km)
Track gauge 4 ft 8 12 in (1,435 mm)
(standard gauge)
Electrification Overhead lines, 25kV AC
Route map
Downtown Rail Extension
future Second Transbay Tube
to Oakland
Embarcadero BSicon LOGO SFmuni.svg Bay Area Rapid Transit
pedestrian
tunnel
Transbay Transit Center Caltrain  CAHSR
4th & King Caltrain BSicon LOGO SFmuni.svg
relocating underground to
4th & Townsend
Caltrain
to San Jose
&
CHSR
to Los Angeles

The Downtown Rail Extension (DTX) is a planned second phase of the Transbay Transit Center. When complete, it will extend the Caltrain Peninsula Corridor commuter rail line from its current northern terminus in San Francisco at 4th and King to the new Transbay Transit Center (TTC) via a 1.3 mi (2.1 km) tunnel. The new terminus at the TTC will be close to the downtown job center of San Francisco and the TTC will provide intermodal connections to BART, Muni, Transbay AC Transit buses, and long-distance buses. In addition, the California High Speed Rail Authority (CHSRA) plans to use DTX and the Caltrain-owned Peninsula Corridor for service on the CHSRA San Francisco–San Jose segment. Because DTX uses a long tunnel, current diesel locomotives are not suitable and the Caltrain Modernization Project (CalMod), which includes electrification of the line and acquisition of electrified rolling stock, is a prerequisite.

Estimated at $3.9 billion, it is projected to cost more than the entire first phase of the Transit Center. As of 2017, only the structural "train box" lowest level has been funded as part of Phase 1 TTC construction.

The final route between the current 4th and King terminus and the TTC has not been finalized, as San Francisco Mayor Ed Lee proposed an alternative route in 2015 which would bypass 4th and King, extending Caltrain and high-speed rail to the Transbay Terminal through a new tunnel branching from the existing line at the 22nd Street station, then following a route generally under Third Street to TTC. Under the 2015 alternative alignment, the existing 4th & King terminal, the Caltrain yard and a portion of Interstate 280 in Mission Bay would be demolished and replaced with infill housing. Other proposed DTX routings include a loop so that trains may leave TTC as other trains are pulling in. In addition, the TTC is a candidate for the western terminus of a second Transbay Tube between San Francisco and Alameda Island, which would add BART service directly into the TTC.


...
Wikipedia

...