A parent and a child sitting in a BART train both point out the train window with excitement.

Link With Us to Improve Train Travel for Future Generations

Get involved with Link21 to learn more about the Program and join the conversation. Sign up to receive updates and stay in the know about upcoming events

Get Involved

A Capitol Corridor train sits at the Jack London Square station in Oakland with a large shadow encompassing half the platform.

Link21 Program Milestone

In June 2025, we reached a Program milestone where standard-gauge (Regional Rail) was chosen as the train technology for the new underground crossing of the San Francisco Bay. We developed concepts in order to analyze the trade-offs and benefits of each train technology. Read our press release.

Learn about our analysis and findings

An aerial view in Richmond, California captures a sprawling residential neighborhood adjacent to the right-of-way for Capitol Corridor and BART service with multiple trains on the tracks.

Imagine a More Connected Future

A new train crossing connecting the San Francisco / Peninsula to Oakland / East Bay will provide more options for reliable travel and train service redundancy. Link21 will connect people to more megaregional destinations with increased access, frequency, and improved service.

Check out our proposed service improvements

Traffic on Westbound Interstate 80 entering the Bay Bridge from Oakland/Emeryville to San Francisco

Working on Solutions for a Better Future

Alongside megaregional partner agencies, we’re reimagining a more connected future that links housing to jobs, school, recreation, and essential services through a more seamless train system.

Learn more about our current planning activities

Where We Are Today and Where We're Going

Link21 is moving toward Project Identification with the help of strong partnerships with megaregional agencies and the community. Together, we are working to create a faster, more connected train system across the 21-county Northern California Megaregion that provides equitable, affordable, and accessible travel for future generations.

Check out our Program phases or visit our current planning activities page to see where we are in the process and how Link21 will unfold over the coming years.