System Development Planning

Expansion & Capacity Enhancement 

The System Development Policy (formerly known as the System Expansion Policy), adopted in September 2023, guides how BART will consistently evaluate proposed new line extensions and stations, including infill stations. Any major new system development project must provide clear, measurable benefits to the system and its riders, as well as demonstrate the ability to address the region’s goals to grow transit ridership, address the climate emergency, and improve mobility.

Projects must support the System Development Policy goals of:

Supporting regional livability, sustainability, and prosperity;
Serving communities and improving rider experience; and  
Supporting stewardship of the BART District and taxpayer investment.

The Policy includes a “business case” process to demonstrate reasoning and justification for initiating a project and how the project supports BART’s vision and mission. The following diagram shows the process for how new stations or line extensions are considered (see the adopted policy and this staff presentation for more details).

Flowchart explaining how Project ideas are evaluated per BART's policy criteria before going into its business case, development and design, then into service

The 2023 System Development Policy supersedes the 1999 System Expansion Policy

A list of completed extensions and infill stations is found at bart.gov/about/history/facts

Active Projects

New Transbay Rail Crossing (Link21)

Link21 aims to create a faster, more connected and accessible network of train service that focuses on passengers, improving the environment, and our quality of life for generations to come. At the core of Link21 is a new train crossing between Oakland and San Francisco, unlocking better travel possibilities across the 21-county Northern California Megaregion.

Learn more about Link21

Silicon Valley Extension

The Santa Clara Valley Transportation Authority (VTA) is managing a project to extend BART to Silicon Valley. The 16-mile extension will provide a fast, reliable, and convenient alternative to driving in two of the most congested highway corridors in the Bay Area.

Learn more about Silicon Valley Extension

Irvington Station as part of Warm Springs Extension

BART is currently designing an infill station within the Irvington district of Fremont. The station will be located approximately halfway in between Fremont Station and Warm Springs/South Fremont Station. Efforts to date have been funded by ACTC Measure BB and MTC RM2.

Learn more about the future Irvington Station