Pennsylvania Avenue Extension

The Pennsylvania Avenue Extension project will support future uninterrupted passenger rail service through San Francisco. The project will place current Caltrain and future California High-Speed Rail passenger rail lines underground, allowing transit, pedestrian, bicycle, and vehicle traffic to flow uninterrupted and improve safety for all road users. The Transportation Authority is studying potential tunnel alignments that will have trains running underground along Seventh Street and Pennsylvania Avenue, in order to remove existing Caltrain rail crossings at Mission Bay Drive and 16th Street and eliminate the need for road users to wait while trains cross. The Transportation Authority has completed the Pennsylvania Avenue Extension Project Initiation Report (PDF), which developed and evaluated a range of conceptual alignment alternatives. The alignment alternatives reflect different tunnel lengths, configurations and construction methods, with varying implications for existing and potential future station locations along the alignment. The project was originally recommended by the San Francisco Planning Department’s Railyard Alignment and Benefits Study, which was completed in 2018. The project will be designed to connect to the Downtown Rail Extension, also known as The Portal, which will bring Caltrain and California High-Speed Rail from 4th and King streets to the Salesforce Transit Center. The Transportation Authority is closely coordinating the Pennsylvania Avenue Extension work with related initiatives, including: The Portal led by the Transbay Joint Powers Authority The Southeast Rail Station Study completed by the SF Planning Department The Bayview Station Study led by the Transportation Authority Multi-agency planning and coordination for the 4th and King Railyards

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