Downtown Rail Extension (DTX)

The Downtown Rail Extension (DTX) will extend Caltrain 1.3 miles underground from its current terminus at 4th and King streets into the new downtown Transit Center and accommodate California’s future High Speed Rail from San Francisco to Los Angeles/Anaheim.
The Metropolitan Transportation Commission (MTC) and the Association of Bay Area Governments (ABAG) jointly approved a Regional Transportation Plan (RTP) that designates the DTX as a regional priority for the federal New Starts program. New Starts is the federal government’s primary financial resource for supporting this type of transit capital investment. As a regional priority for New Starts, the project will begin working with the U.S. Department of Transportation (DOT) towards a Full Funding Grant Agreement that would allow for construction of the DTX.


Caltrain already serves as a vital regional link by connecting San Francisco to the Peninsula, Silicon Valley and San Jose, but it currently ends 1.3 miles from downtown San Francisco. The DTX will extend the Caltrain rail line into the new Transit Center, the heart of San Francisco’s new downtown. Extending Caltrain into downtown will directly save commuters almost an hour a day in travel time, and will result in less driving and more people taking the train into the City from the Peninsula. More than 33,000 Peninsula passengers will use the Transit Center each weekday. The underground rail line will run from Caltrain’s current terminus at 4th and King street beneath Second Street and into the new Transit Center.

For additional information on Caltrain, please visit Caltrain’s website at:

California High Speed Rail

The DTX will accommodate California’s High Speed Rail. California high speed rail system will connect the mega-regions of the state, contribute to economic development and a cleaner environment, create jobs and preserve agricultural and protected lands. By 2029, the system will run from the Transbay Transit Center in San Francisco to the Los Angeles basin. The system will eventually extend to Sacramento and San Diego, totaling 800 miles with up to 24 stations.

California High Speed Rail will allow trains to travel at speeds over 200 miles per hour, similar to high speed trains in Europe and Asia, reducing the travel time between San Francisco and Los Angeles to under three hours. The system is expected to transport up to 32 million intercity passengers annually and another 10 million commuters. It will connect with existing rail, airway, and highway systems, allowing intercity commuters and long distance travelers easier access to metropolitan regions and other transit options, reducing traffic conditions and improving air quality by taking people out of their cars and off our freeways. This will help address traffic congestion in California cities, projected to continue to be among the nation’s worst by 2029.

According to the California High Speed Rail Authority, the system will result in an estimated 4 to 8 million metric tons of CO2 saved by 2030, making a significant contribution to California’s goals in AB 32 and SB 375. The Authority also estimates the system will create 20,000 construction jobs annually for the five year schedule for construction of the first leg of the initial operating section; and additional building to complete the San Francisco to Los Angeles line will generate an additional 66,000 jobs annually for 15 years. The Authority expects the Initial Operating Section, once fully operational, will directly employ an estimated 4,500 permanent jobs and anticipates that the increased economic activity associated with development and implementation of the high speed rail system could indirectly generate up to 400,000 additional long-term, permanent jobs statewide.

For additional information on California High Speed Rail, please visit the California High Speed Rail Authority’s website at:

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