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A ten-mile spur line in eastern Contra Costa County will utilize a third set of rail technologies. With an average of , weekday passengers and 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 s and operated its last transbay crossing in By the mids, that system had been dismantled in favor of highway travel.
A s 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. The district initially began with five members, all of which were projected to receive BART lines: 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.
Voters in the three remaining participating counties approved the truncated system, with termini in Fremont, Richmond, Concord, and Daly City, in Construction of the system began in , 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.
Passenger service began on September 11, , initially just between MacArthur and Fremont. The rest of the system opened in stages, with the entire system opening in when the transbay service though the Transbay Tube began. 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. Even before the BART system opened, planners projected several possible extensions.
The system was expanded to San Francisco International Airport in and to Oakland International Airport via an automated guideway transit spur line in Construction of eBART , an extension using diesel multiple units along conventional railroad tracks between Pittsburg and Antioch , is underway as of Further expansion has been proposed, contingent upon the allocation of funding.
This includes the second phase of the Silicon Valley extension , which would bring the system to downtown San Jose and Santa Clara.
Other plans have included an extension to Hercules, a line along the Interstate Highway corridor, and a fourth set of rail tracks through Oakland. BART has also been studying ways to improve service and reliability in its core system, where density and ridership is highest. Since the mids, BART has been trying to modernize its system. The rough black tiles on the platform edge mark the location of the doorway of approaching trains, allowing passengers to wait at the right place to board.
All faregates and ticket vending machines were replaced. In , BART stated its intention to improve non-peak night and weekend headways for each line to 15 minutes. The current minute headways at these times is a barrier to ridership. In BART announced that it would install solar panels at two yards and maintenance facilities and the Orinda station  the only station with enough sun to justify installation cost. A study  shows that along with some Bay Area freeways, some of BART's overhead structures could collapse in a major earthquake, which has a significant probability of occurring within three decades.
The entirety of the system runs in exclusive right-of-way. On the main lines, approximately 28 miles of lines run through underground sections with 32 miles on elevated tracks. Track segments are internally referred to by letter: Train frequencies are primarily limited by the fact that most lines funnel into the Transbay Tube and San Francisco. While a small sections of track in Oakland, Colma, and Daly City are triple- and quadruple-tracked, there are few sidings which would allow limited-stop or express trains to pass others.
Many of the original s-era stations, especially the aerial stations, feature simple Brutalist architecture , but newer stations are a mix of Neomodern and Postmodern architecture. The combination of unique loading gauges and bespoke rail technologies has complicated maintenance of the system, as rolling stock requires custom wheelsets, brake systems, and power systems.
Most segments of the BART system carry trains of more than one route. Trains regularly operate on five routes. Unlike most other rapid transit and rail systems around the world, BART lines are generally not referred to by shorthand designations — they are only occasionally referred to officially by color names.
The five BART lines are identified on maps, schedules, and signage in stations by the names of their termini:. In addition, BART also operates a separate automated guideway transit line:. BART was one of the first U. Station-to-station train movement, including speed control and maintenance of separation between successive trains, is entirely automatic under normal operation, the operator's routine responsibilities being issuing announcements, closing the doors after stations stops, and monitoring the track ahead for hazards.
In unusual circumstances the operator controls the train manually at reduced speed. BART operates four types of cars, built from three separate orders, totaling cars. To run a typical peak morning commute, BART requires cars. Of those, are scheduled to be in active service; the others are used to build up four spare trains essential for maintaining on-time service.
The Coliseum—Oakland International Airport line uses a completely separate and independently operated fleet as it uses cable car-based automated guideway transit technology.
It uses four Cable Liner trains built by DCC Doppelmayr Cable Car , arranged as three-car sets, but the system can accommodate four-car trains in the future. The first test car was unveiled in April At least 20 cars are expected by December ; however, in early November , a test train failed a CPUC regulatory inspection due to door issues, leaving the planned revenue service date in doubt, similar issues occurred with New York City Subway R's built by the same manufacturer.
The first will be delivered in June BART has five rapid transit lines; most of each line's length is on track shared with other lines. Trains on each line run every 15 minutes on weekdays and 20 minutes during evenings, weekends and holidays; stations on the section of track between Daly City and West Oakland are served by four lines and therefore see 16 trains an hour on each track.
BART service begins around 4: Service ends every day near midnight with station closings timed to the last train at station. Fares on BART are comparable to those of commuter rail systems and are higher than those of most subways , especially for long trips. The fare is based on a formula that takes into account both the length and speed of the trip. Passengers can use refillable paper-plastic-composite tickets,  on which fares are stored via a magnetic strip, to enter and exit the system.
The exit faregate prints the remaining balance on the ticket each time the passenger exits the station. A paper ticket can be refilled at a ticket machine, the remaining balance on any ticket can be applied towards the purchase of a new one, or a card is captured by the exit gate when the balance reaches zero; multiple low value cards can be combined to create a larger value card but only at specific ticket exchange locations, located at some BART stations.
Clipper , a contactless smart card accepted on all major Bay Area public transit agencies, may be used in lieu of a paper ticket. Passengers without sufficient fare to complete their journey must use a cash-only AddFare machine to pay the remaining balance in order to exit the station. Special color-coded tickets provide steep discounts for children, the disabled , seniors, and students. Unlike many other rapid transit systems, BART does not have an unlimited ride pass, and the only discount provided to the public is a 6.
The tickets can be used only on weekdays. Most special discounted tickets must be purchased at selected vendors and not at ticket machines. The San Francisco Muni "A" monthly pass provides unlimited rides within San Francisco, with no fare credit applied for trips outside of the city. Fares are enforced by the station agent, who monitors activity at the fare gates adjacent to the window and at other fare gates through closed circuit television and faregate status screens located in the agent's booth.
All stations are staffed with at least one agent at all times. Proposals to simplify the fare structure abound. A flat fare that disregards distance has been proposed, or simpler fare bands or zones. Either scheme would shift the fare-box recovery burden to the urban riders in San Francisco, Oakland and Berkeley and away from suburban riders in East Contra Costa, Southern Alameda, and San Mateo Counties, where density is lowest, and consequently, operational cost is highest.
In , the system was carrying approximately , more passengers each day than it had five years earlier. Stations in the urban cores of San Francisco, Oakland, and Berkeley have the highest ridership, while suburban stations record lower rider numbers. During fiscal year , the busiest station was Embarcadero with 48, average weekday exits, followed by Montgomery Street with 45, BART's one-day ridership record was set on Halloween of with , passengers attending the San Francisco Giants' victory parade for their World Series championship.
Capitol Corridor trains run from Sacramento to San Jose from both stations. Additionally, Richmond has connections to the San Joaquin and the nationally serviced California Zephyr. Caltrain , which provides service between San Francisco , San Jose and Gilroy , has a cross-platform interchange at Millbrae.
Connections to San Francisco's local light rail system, the Muni Metro , are facilitated primarily through the twin-level Market Street subway. Many BART stations offer parking, however, under-pricing causes station parking lots to overflow in the morning.
Riders can transfer from BART and complete their journeys by car. The Coliseum—Oakland International Airport line is an automated guideway transit line that connects from Coliseum station to all terminals at the Oakland International Airport. Unlike similar services at other airports, fares for the line are integrated into the BART fare system, to which the BART ticket faregates for the line are located on the Coliseum station platform. The line's automated guideway transit AGT vehicles are cable-propelled, and operate on an elevated guideway 3.
It arrives at Coliseum station every 5 to 20 minutes,  and are designated to transport passengers to OAK in 10—15 minutes. In , BART became the first transit system in the United States to offer cellular telephone communication to passengers of all major wireless carriers on its trains underground. In , service was expanded to include the Transbay Tube, thus providing continuous cellular coverage between West Oakland and Balboa Park.
As of passengers in both the Berkeley Hills tunnel and the Berkeley subway Ashby, Downtown and North Berkeley received cell service. It initially included the four San Francisco downtown stations: Embarcadero, Montgomery, Powell, and Civic Center. The testing and deployment was extended into the underground interconnecting tubes between the four downtown stations and further. The successful demonstration provided for a ten-year contract with WiFi Rail, Inc.
Since the district has been adding Library-a-Go-Go book vending machines. A nine-member elected Board of Directors represents nine districts. BART has its own police force. While the district includes all of the cities and communities in its jurisdiction, some of these cities do not have stations on the BART system.
BART, like other transit systems of the same era, 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. Within San Francisco city limits, Muni provides local light rail surface and subway service, and runs with smaller headways and therefore provides more frequent service than BART. In the s, BART had envisioned frequent local service, with headways as short as two minutes between trains on the quadruple-interlined section in San Francisco and six minutes on each individual line.