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BARTis 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 Jos stations opened as part of the under construction Silicon Valley BART extension in partnership with the Santa Clara Valley Transportation Authority (VTA).[10]

BART has elements of both traditional rapid transit (high-frequency urban service with close station spacing) and commuter rail/regional rail (lower-frequency suburban service with wider station spacing). Trains on each primary service run every 20 minutes, except the busy Yellow Line, which operates every 10 minutes on weekdays.[14] Segments served by multiple lines have higher frequencies, the busiest of which is the section between Daly City and West Oakland, which has around 15 trains per hour (one train about every four minutes), per direction at peak hours.[7] The Oakland Airport Connector runs "on demand", typically on headways of 10 minutes or less.[13]

Timed cross-platform transfers are available between the Orange Line, which operates only in the East Bay, and the Yellow Line, which operates through the Transbay Tube to the San Francisco Peninsula. This service complements the Red Line during daytime hours and replaces that line when it stops operating after 9pm.[7]

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.

The Early Bird Express network provides service to major BART stations between 3:50 am and 5:30 am. Two San Francisco/Peninsula routes and seven Transbay routes run between a limited number of major BART stations, with the San Francisco/Peninsula and Transbay routes meeting at the Transbay Transit Center. The original Early Bird Express network introduced in February 2019 had fifteen routes, but some were eliminated later that year due to low ridership.[16][17][18]

BART and most lines of San Francisco's Muni Metro light rail system share four stations (Embarcadero, Montgomery Street, Powell Street, and Civic Center/UN Plaza) in the Market Street subway; connections are also available to three lines at Balboa Park station and one line at Glen Park station. A tunnel at the Powell Street station connects to the Union Square/Market Street station on the Muni Metro T Third Street line. In the South Bay, Milpitas station provides a connection to the Orange Line of VTA light rail.[12]

BART is served by bus connections from regional and local transit agencies at all stations, most of which have dedicated off-street bus transfer areas. Many connecting routes (particularly in suburban areas) serve primarily as feeder routes to BART. Larger bus systems connecting to BART include Muni in San Francisco, AC Transit in the East Bay, SamTrans in San Mateo County, County Connection and Tri Delta Transit in eastern Contra Costa County, WestCAT in western Contra Costa County, WHEELS in the Tri-Valley, VTA in the Santa Clara Valley, and Golden Gate Transit. Smaller systems include Emery Go-Round in Emeryville, Commute.org on the Peninsula, San Leandro LINKS, Dumbarton Express, and Union City Transit. The Transbay Transit Center regional bus hub is located one block from Embarcadero and Montgomery stations.[19]

Several transit agencies offer limited commuter-oriented bus service from more distant cities to outlying BART stations; these include VINE from Napa County, Solano Express from Solano County, Rio Vista Delta Breeze, Stanislaus Regional Transit Authority from Stanislaus County, and San Joaquin RTD from Stockton. Many BART stations are also served by privately run employer and hospital shuttles, and privately run intercity buses stop at several stations.[19]

BART also runs directly to two of the three major Bay Area airports (San Francisco International Airport and San Francisco Bay Oakland International Airport) with service to San Jose International Airport provided by a VTA bus route available at Milpitas station.[19][12]

Some of the Bay Area Rapid Transit system's current coverage area was once served by an electrified streetcar and suburban train system called the Key System. This early 20th-century system once had regular transbay traffic across the lower deck of the Bay Bridge, but the system was dismantled in the 1950s, with its last transbay crossing in 1958, and was superseded by highway travel. A 1950s study of traffic problems in the Bay Area concluded the most cost-effective solution for the Bay Area's traffic woes would be to form a transit district charged with the construction and operation of a new, high-speed rapid transit system linking the cities and suburbs.[20] Marvin E. Lewis, a San Francisco trial attorney and member of the city's board of supervisors spearheaded a grassroots movement to advance the idea of an alternative bay crossing and the possibility of regional transit network.[21]

Formal planning for BART began with the setting up in 1957 of the San Francisco Bay Area Rapid Transit District, a county-based special-purpose district body that governs the BART system. The district initially began with five members, all of which were projected to receive BART lines: Alameda County, Contra Costa County, the City and County of San Francisco, San Mateo County, and Marin County. Although invited to participate, Santa Clara County supervisors elected not to join BART due to their dissatisfaction that the peninsula line only stopped at Palo Alto initially, and that it interfered with suburban development in San Jose, preferring instead to concentrate on constructing freeways and expressways. Though the system expanded into Santa Clara County in 2020, as of June 2024 it is still not a district member.

In 1962, San Mateo County supervisors voted to leave BART, saying their voters would be paying taxes to carry mainly Santa Clara County residents (presumably along I-280, SR 92, and SR 85).[22] The district-wide tax base was weakened by San Mateo's departure, forcing Marin County to withdraw a month later. Despite the fact that Marin had originally voted in favor of BART participation at the 88% level, its marginal tax base could not adequately absorb its share of BART's projected cost. Another important factor in Marin's withdrawal was an engineering controversy over the feasibility of running trains on the lower deck of the Golden Gate Bridge, an extension forecast as late as three decades after the rest of the BART system.[23][24][25] The withdrawals of Marin and San Mateo resulted in a downsizing of the original system plans, which would have had lines as far south as Palo Alto and northward past San Rafael. Voters in the three remaining participating counties approved the truncated system, with termini in Fremont, Richmond, Concord, and Daly City, in 1962.[26]

Construction of the system began in 1964, and included a number of major engineering challenges, including excavating subway tunnels in San Francisco, Oakland, and Berkeley; constructing aerial structures throughout the Bay Area, particularly in Alameda and Contra Costa counties; tunneling through the Berkeley Hills on the Concord line; and lowering the system's centerpiece, the Transbay Tube connecting Oakland and San Francisco, into a trench dredged onto the floor of San Francisco Bay.[27] Like other transit systems of the same era, BART endeavored to connect outlying suburbs with job centers in Oakland and San Francisco by building lines that paralleled established commuting routes of the region's freeway system.[28] BART envisioned frequent local service, with headways as short as two minutes between trains through the Transbay Tube and six minutes on each individual line.[29]

Passenger service began on September 11, 1972, initially just between MacArthur and Fremont. The rest of the system opened in stages, with the entire system opening in 1974 when the transbay service through the Transbay Tube began.[30] The new BART system was hailed as a major step forward in subway technology,[31] although questions were asked concerning the safety of the system[32] and the huge expenditures necessary for the construction of the network.[33] Ridership remained well below projected levels throughout the 1970s, and direct service from Daly City to Richmond and Fremont was not phased in until several years after the system opened.

Some of the early safety concerns appeared to be well founded when the system experienced a number of train-control failures in its first few years of operation. As early as 1969, before revenue service began, several BART engineers identified safety problems with the Automatic Train Control (ATC) system. The BART Board of Directors was dismissive of their concerns and retaliated by firing them.[34] Less than a month after the system's opening, on October 2, 1972, an ATC failure caused a train to run off the end of the elevated track at the terminal Fremont station and crash to the ground, injuring four people.[35][36] The "Fremont Flyer" led to a comprehensive redesign of the train controls and also resulted in multiple investigations being opened by the California State Senate, California Public Utilities Commission, and National Transportation Safety Board.[37] Hearings by the state legislature in 1974 into financial mismanagement at BART forced the General Manager to resign in May 1974, and the entire Board of Directors was replaced the same year when the legislature passed legislation leading to the election of a new Board and the end of appointed members.[38][39][40][41][42][43]

Even before the BART system opened, planners projected several possible extensions. Although Marin County was left out of the original system, the 1970 Golden Gate Transportation Facilities Plan considered a tunnel under the Golden Gate or second deck on the bridge, but neither of these plans was pursued.[44] Over twenty years would pass before the first extensions to the BART system were completed to Colma and Pittsburg/Bay Point in 1996. An extension to Dublin/Pleasanton in 1997 added a fifth line to the system for the first time in BART's history. The system was expanded to San Francisco International Airport in 2003 and to Oakland International Airport (now San Francisco Bay Oakland International Airport) via an automated guideway transit spur line in 2014.[45][46] eBART, an extension using diesel multiple units along conventional railroad infrastructure between Pittsburg/Bay Point and Antioch on the Yellow Line, opened on May 26, 2018. BART's most significant current extension project is the Silicon Valley BART extension on the Green and Orange Lines. The first phase extended the Fremont line to Warm Springs/South Fremont in early 2017, and the second phase to Berryessa/North San Jos began service on June 13, 2020. The third phase to Santa Clara is contingent upon the allocation of funding as of May 2020[update], but is planned to be completed by 2036.[47]

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