BART operates five named and interlined heavy rail services plus one separate automated guideway line. All of the heavy rail services run through
Oakland, and all but the Orange Line run through the
Transbay Tube to San Francisco. All five services run until 9 pm; only three services operate evenings after 9 pm, as well as some Sundays during maintenance work. All stations are served during all service hours. The
eastern segment of the , between Antioch and the transfer platform east of Pittsburg/Bay Point, uses different rolling stock and is separated from the rest of the line. Unlike most other rapid transit and rail systems around the world, BART lines were not primarily referred to by shorthand designations or their color names (although the colors used on maps have been constant since 1980). The services were mainly identified on maps, schedules, and station signage by the names of their termini. However, the new fleet displays line colors more prominently, and BART has begun to use color names in press releases and
GTFS data. In 2022, BART formally announced on Twitter they were using colors on the line map and officially. == Stations ==