San Francisco

Salesforce Transit Center (STC)

The 4th and King Street Station will serve as the interim terminal station for high-speed rail service until completion of the Downtown Rail Extension (DTX) project, which is a 1.3 mile tunnel that will extend the rail corridor to the train box in the Salesforce Transit Center.

High-speed rail trains will use the track built for DTX to reach Salesforce Transit Center — the ultimate terminal station in San Francisco.



Project Section

This station community is part of the San Francisco to San José project section.


700 4th Street, San Francisco 94107


Until the completion of Downtown Extension (DTX) project, the environmental analysis is studying the Caltrain station at 4th and King in downtown San Francisco as an interim station.

The station improvements would include:

• Modifying existing tracks and platforms

• Installing a booth for high-speed rail ticketing and support services

• Adding high-speed rail fare gates

To support high-speed rail operations, two existing Caltrain platforms would be raised and lengthened to serve four high-speed rail tracks. Ramps would be installed to provide pedestrian access from the station building to the raised platforms. All other platforms and tracks would continue to be used for Caltrain service.

The Salesforce Transit Center was completed in 2018 and the DTX has been environmentally cleared by the Transbay Joint Powers Authority (TJPA). In 2020, the Authority, TJPA, and other partners in San Francisco entered into a Memorandum of Understanding (MOU) to advance the DTX toward construction. Once constructed, DTX will provide a tunnel to link STC to the existing terminus of the Caltrain commuter rail line at 4th and King Streets.

Salesforce Transit Center Cutaway View


Visit: San Francisco to San José


Screenshot of animated video describing station community concepts.
This video is a conceptual representation of how a Station Community could can grow over time, and is not intended to depict how the actual stations will look. The concept represents plans for sustainability, functionality, and the use of best practices at each of the high-speed rail stops.

Get up to speed at

All the latest information on what's happening and where as we build California's high-speed rail

The California High-Speed Rail Authority makes every effort to ensure the website and its contents meet mandated ADA requirements as per the California State mandated Web Content Accessibility Guidelines 2.0 Level AA standard. If you are looking for a particular document not located on the California High-Speed Rail Authority website, you may make a request for the document under the Public Records Act through the Public Records Act page. If you have any questions about the website or its contents, please contact the Authority at