Overview
People exiting a Caltrain vehicle

Photo: Sergio Ruiz, Flickr

Introduction

The Downtown Rail Extension project will extend Caltrain and future California High-Speed Rail service from the existing 4th and King railyard to the newly-constructed Salesforce Transit Center. The Transbay Joint Powers Authority oversees the Caltrain Downtown Extension Project.

In fall 2018, the Transportation Authority Board selected a preferred route for the Downtown Extension to continue south from the 4th and King Street via tunnel along Pennsylvania Avenue to avoid conflicts with 16th Street, a major east-west travel corridor serving Mission Bay. This route was also endorsed by Mayor Breed following completion of SF Planning’s Rail Alignments and Benefit study.

Timeline and Status

In late 2018 and early 2019, the Transbay Joint Powers Authority and Federal Transit Administration provided local and Federal environmental approvals for the Downtown Rail Extension, a major milestone in project development. The Pennsylvania Avenue Alignment will be the subject of a separate subsequent environmental review process.

The Transbay Joint Power Authority's goal is to complete the project by 2029, pending funding.

Project Partners

The Transbay Joint Powers Authority is leading the development of the Downtown Rail Extension project, in partnership with Caltrain, CA High Speed Rail Authority, the Metropolitan Transportation Commission, the City and County of San Francisco and the Transportation Authority.

Cost and Funding

The total cost of the Caltrain Downtown Extension project is approximately $3.9 billion. The Transportation Authority has allocated about $66 million in Prop K half-cent transportation sales tax funds toward Caltrain Downtown Extension. We also provide oversight for the project. 

The project is in the early design phase and faces a significant funding gap. The Transbay Joint Powers Authority preliminary funding plan is comprised of state, federal, regional, local, and private sources. 

The Transportation Authority is conducting a review of the project's governance, oversight, funding, and project delivery strategy. 

Resources

Executive Summary: Rail Alignment and Benefits Study, SF Planning, 2018 (PDF)

California High-Speed Rail website 

Transbay Joint Powers Authority website

Contact 

Eric Cordoba, Deputy Director for Capital Projects: eric.cordoba@sfcta.org

Transbay Joint Powers Authority: info@tjpa.org

Related programs

The Salesforce Transit Center is San Francisco’s new regional transit hub.

The Caltrain Electrification project will bring fully electrified service to Caltrain.
A bus in a red bus-only lane on Market Street, surrounded by green bike lanes.

San Francisco's voter-approved Transit-First Policy states that decisions regarding the use of our public streets and sidewalks shall prioritize public rights of way for pedestrians, bicyclists, and public transit.