The heavy-rail public transit system connects San Francisco with cities in the East Bay and suburbs in northern San Mateo County. BART operates five lines on 104 miles (167 km) of track with 43 stations in four counties. With average weekday ridership of 327,629 passengers, BART is the fifth-busiest heavy rail rapid transit system in the United States.
BART system map. Source: www.bart.gov
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. Although the lines have been colored consistently on BART system maps for more than a decade, they are only occasionally referred to officially by color names, and only rarely referred to in this way by members of the public (e.g., the "Red Line"). Instead, the five BART lines are generally identified on maps and schedules by the names of their termini:
12th St. Oakland City Center, 16th St. Mission (SF), 19th St. Oakland, 24th St. Mission (SF), Ashby (Berkeley), Balboa Park (SF), Bay Fair (San Leandro), Castro Valley, Civic Center (SF), Coliseum/Oakland Airport, Colma, Concord, Daly City, Downtown Berkeley, Dublin/Pleasanton, El Cerrito del Norte, El Cerrito Plaza, Embarcadero (SF), Fremont, Fruitvale (Oakland), Glen Park (SF), Hayward, Lafayette, Lake Merritt (Oakland), MacArthur (Oakland), Millbrae, Montgomery St. (SF), North Berkeley, North Concord/Martinez, Orinda, Pittsburg/Bay Point, Pleasant Hill, Powell St. (SF), Richmond, Rockridge (Oakland), San Bruno, San Francisco Int'l Airport, San Leandro, South Hayward, South San Francisco, Union City, Walnut Creek, West Oakland