O  Orange Line
Warm Springs-bound train in San Leandro in 2018
Overview
Owner	San Francisco Bay Area Rapid Transit District
Locale	South Bay, East Bay
Termini	Berryessa/​North San José Richmond
Stations	21
Service
Type	Rapid transit
System	Bay Area Rapid Transit
History
Opened	September 11, 1972 (1972-09-11)
Last extension	June 13, 2020 (2020-06-13)
Technical
Line length	51 mi (82 km)
Track gauge	5 ft 6 in (1,676 mm)
Electrification	Third rail, 1 kV DC
Operating speed	70 mph (110 km/h)[1]
Route map Orange Line highlighted in orange Show interactive map Legend Amtrak to Bakersfield/Seattle/Chicago Richmond Maintenance Yard Richmond Richmond Greenway I-80 El Cerrito del Norte El Cerrito Plaza Contra Costa County Alameda County North Berkeley Ohlone Greenway Downtown Berkeley SR 13 Ashby SR 24 ■ to Antioch MacArthur southbound transfer I-580 I-980 / SR 24 19th Street Oakland northbound transfer 12th Street Oakland City Center ■ ■ to SFO/Millbrae ■ ■ to Daly City Lake Merritt Fruitvale Coliseum ■ to OAK SR 112 / SR 61 San Leandro Bay Fair transfer ■ to Dublin/​Pleasanton I-238 Hayward SR 92 South Hayward Amtrak Hayward Complex Union City Alameda Creek   ACE to Stockton SR 84 Fremont Lake Elizabeth tunnel Irvington 2026 Warm Springs/​South Fremont SR 262 Alameda County Santa Clara County Calaveras proposed SR 237 Milpitas (via ) Berryessa/​North San José   planned Silicon Valley extension US 101 28th Street/Little Portugal Downtown San Jose SR 87 Diridon I-880 Santa Clara Maintenance Facility Santa Clara All stations are accessible This diagram: view talk edit Show route diagram

The Orange Line is a Bay Area Rapid Transit (BART) line in the San Francisco Bay Area that runs between Berryessa/North San José station and Richmond station. It has 21 stations in San Jose, Milpitas, Fremont, Union City, Hayward, San Leandro, Oakland, Berkeley, El Cerrito, and Richmond. It is the only one of the five primary BART services that does not run through the Transbay Tube to San Francisco; however, it shares tracks with the four other primary services in the East Bay.

The Orange Line was the first BART line to open. Initial services between MacArthur and Fremont stations began on September 11, 1972, with full service extending to Richmond beginning on January 29, 1973.^[2]

The line would not see any major changes for another 45 years, until the start of the Silicon Valley BART extension. The first phase of the project extended the line to Warm Springs/South Fremont station in March 2017,^[3][4] the second phase added Berryessa/North San José and Milpitas stations in June 2020.^[5][6]

The Orange Line runs primarily north-south through the East Bay. It uses the R-Line between Richmond station and just north of MacArthur station, the K-Line between MacArthur and the Oakland Wye, the A-Line between the Wye and Fremont station, and the S-Line between Fremont and Berryessa/North San José station. Most sections are at-grade or elevated; the line runs through tunnels in downtown Berkeley, downtown Oakland, and under Lake Elizabeth.