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Bay Area Rapid Transit
Bay Area Rapid Transit (BART) is a rapid transit system serving the San Francisco Bay Area in California. BART serves 50 stations along six routes and 131 miles (211 kilometers) of track, including eBART, a 9-mile (14 km) spur line running to Antioch, and Oakland Airport Connector, a 3-mile (4.8 km) automated guideway transit line serving Oakland San Francisco Bay Airport. With an average of 180,200 weekday passenger trips as of the second quarter of 2025 and 50,791,900 annual passenger trips in 2024, BART is the seventh-busiest rapid transit system in the United States.
BART is operated by the San Francisco Bay Area Rapid Transit District which formed in 1957. The initial system opened in stages from 1972 to 1974. The system has been extended several times, most recently in 2020, when Milpitas and Berryessa/North San José stations opened as part of the under construction Silicon Valley BART extension in partnership with the Santa Clara Valley Transportation Authority (VTA).
BART serves large portions of its three member counties – San Francisco, Alameda, and Contra Costa – as well as smaller portions of San Mateo County and Santa Clara counties. The system has 50 stations: 22 in Alameda County, 12 in Contra Costa County, 8 in San Francisco, 6 in San Mateo County, and 2 in Santa Clara County. BART operates five named heavy rail services plus one separate automated guideway line. All of the heavy rail services run through Oakland, and all but the Orange Line cross the bay through the Transbay Tube to San Francisco. All five services run every day until 9 pm; only three services operate evenings after 9 pm. All stations are served during all service hours. The eastern segment of the Yellow Line (between Antioch and the transfer platform east of Pittsburg/Bay Point) uses different rolling stock and is separated from the rest of the line.
BART's network topology, which mixes densely-packed urban stations served at high frequencies by multiple interlined services along a central trunk (West Oakland to Daly City, served by all lines but the Orange) with branching suburban lines with widely-spaced stations and lower frequencies, is similar to European S-Bahn systems. Trains on each primary service run every 20 minutes, except the busy Yellow Line, which operates every 10 minutes on weekdays. However, many stations are served by multiple lines; the trunk between West Oakland and Daly City receives 15 trains per hour (average four-minute headways) in peak hours. The Oakland Airport Connector runs "on demand", typically on headways of 10 minutes or less.
Timed cross-platform transfers are available between the Orange Line, which runs north-south through the East Bay, and the Yellow Line, which operates through the Transbay Tube to serve the San Francisco Peninsula. This service complements the Red Line during daytime hours and replaces that line when it stops operating after 9:00 p.m.
The first inbound trains leave outer terminals around 5:00 am on weekdays, 6:00 am on Saturdays, and 8:00 am on Sundays and most holidays. The last trains of the service day leave their terminals around midnight; the final Yellow and Orange Line trains in both directions meet at MacArthur station, and the final Orange and Blue Line trains in the southbound direction meet at Bay Fair station, for guaranteed transfers.
Two different bus networks are operated by regional transit agencies as a rail replacement bus service when BART is not operating due to regularly scheduled maintenance during the overnight hours.
The All Nighter network provides basic bus service to San Francisco, the East Bay, and Peninsula, replicating rail transit services in those regions, including BART, Caltrain, and Muni Metro. All Nighter buses serve most BART stations (directly or within several blocks), replicating 3-Line late night BART service with abbreviated routes:
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Bay Area Rapid Transit
Bay Area Rapid Transit (BART) is a rapid transit system serving the San Francisco Bay Area in California. BART serves 50 stations along six routes and 131 miles (211 kilometers) of track, including eBART, a 9-mile (14 km) spur line running to Antioch, and Oakland Airport Connector, a 3-mile (4.8 km) automated guideway transit line serving Oakland San Francisco Bay Airport. With an average of 180,200 weekday passenger trips as of the second quarter of 2025 and 50,791,900 annual passenger trips in 2024, BART is the seventh-busiest rapid transit system in the United States.
BART is operated by the San Francisco Bay Area Rapid Transit District which formed in 1957. The initial system opened in stages from 1972 to 1974. The system has been extended several times, most recently in 2020, when Milpitas and Berryessa/North San José stations opened as part of the under construction Silicon Valley BART extension in partnership with the Santa Clara Valley Transportation Authority (VTA).
BART serves large portions of its three member counties – San Francisco, Alameda, and Contra Costa – as well as smaller portions of San Mateo County and Santa Clara counties. The system has 50 stations: 22 in Alameda County, 12 in Contra Costa County, 8 in San Francisco, 6 in San Mateo County, and 2 in Santa Clara County. BART operates five named heavy rail services plus one separate automated guideway line. All of the heavy rail services run through Oakland, and all but the Orange Line cross the bay through the Transbay Tube to San Francisco. All five services run every day until 9 pm; only three services operate evenings after 9 pm. All stations are served during all service hours. The eastern segment of the Yellow Line (between Antioch and the transfer platform east of Pittsburg/Bay Point) uses different rolling stock and is separated from the rest of the line.
BART's network topology, which mixes densely-packed urban stations served at high frequencies by multiple interlined services along a central trunk (West Oakland to Daly City, served by all lines but the Orange) with branching suburban lines with widely-spaced stations and lower frequencies, is similar to European S-Bahn systems. Trains on each primary service run every 20 minutes, except the busy Yellow Line, which operates every 10 minutes on weekdays. However, many stations are served by multiple lines; the trunk between West Oakland and Daly City receives 15 trains per hour (average four-minute headways) in peak hours. The Oakland Airport Connector runs "on demand", typically on headways of 10 minutes or less.
Timed cross-platform transfers are available between the Orange Line, which runs north-south through the East Bay, and the Yellow Line, which operates through the Transbay Tube to serve the San Francisco Peninsula. This service complements the Red Line during daytime hours and replaces that line when it stops operating after 9:00 p.m.
The first inbound trains leave outer terminals around 5:00 am on weekdays, 6:00 am on Saturdays, and 8:00 am on Sundays and most holidays. The last trains of the service day leave their terminals around midnight; the final Yellow and Orange Line trains in both directions meet at MacArthur station, and the final Orange and Blue Line trains in the southbound direction meet at Bay Fair station, for guaranteed transfers.
Two different bus networks are operated by regional transit agencies as a rail replacement bus service when BART is not operating due to regularly scheduled maintenance during the overnight hours.
The All Nighter network provides basic bus service to San Francisco, the East Bay, and Peninsula, replicating rail transit services in those regions, including BART, Caltrain, and Muni Metro. All Nighter buses serve most BART stations (directly or within several blocks), replicating 3-Line late night BART service with abbreviated routes: