Distrito de Transporte Rápido del Área de la Bahía
Bay Area Rapid Transit (BART) is a heavy rail rapid transit system in the San Francisco Bay Area in California, United States. With average weekday ridership around passengers in , BART is the fifth busiest rapid transit system in the United States. BART is administered by the Bay Area Rapid Transit District, a special district government agency formed by Alameda, Contra Costa, and San Francisco counties.