The Bay Area Rapid Transit District (BART) proposes to implement capacity improvements in the 104-mile Transbay corridor between Oakland and Daly City in South San Francisco. The project includes communication-based train control (CBTC), procurement of 306 heavy rail cars, additional traction power substations, and expansion of the Hayward Maintenance Complex. The project’s current estimated capital cost is between $1.6 billion and $2.0 billion, and BART expects to seek $900 million from the Core Capacity program.