Antioch is a terminal station on the yellow line serving northern and eastern Contra Costa County. It is part of a new rail system that connects to BART's Pittsburg/Bay Point station using state-of-the art Diesel Multiple Unit (DMU) vehicles.[from bart website]

Bay Area Rapid Transit Maintenance Yard, Hayward

The little BART car that particpates in many of the Bay Area parades.

Powell Street is a shared Muni Metro and Bay Area Rapid Transit station near the intersection of Market Street and Powell Street in downtown San Francisco. The station is located along the Market Street Subway and extends underground from Fourth Street to Fifth Street.[from wikipedia]

Santa Clara County, officially the County of Santa Clara, is the sixth-most populous county in the U.S. state of California, with a population of 1,936,259 as of the 2020 census.[4] Santa Clara County and neighboring San Benito County form the San Jose—Sunnyvale—Santa Clara metropolitan statistical area, which is part of the larger San Jose—San Francisco—Oakland combined statistical area.[from wikipedia]

Bay Area Rapid Transit District stations over the years.

To run a typical peak morning commute, BART requires 579 cars. Of those, 535 are scheduled to be in active service; the others are used to build up four spare trains (used to maintain on-time service).[from wikipedia]