BART Service Restored After Hours of Systemwide Computer Issue Left Thousands Stranded

BART stations across the Bay were closed since 8 a.m. to approximately 12:30 p.m. Sunday "due to a systemwide computer problem."

BART remains CLOSED until further notice. Seek alternate transportation options. Partner transit agencies are providing bus service throughout BART's service area including MUNI, AC Transit, VTA, Tri Delta, CCCTA, and WHEELS.
— SFBARTalert (@SFBARTalert) September 13, 2020

SFMTA was providing bus service between downtown San Francisco and Daly City on line 14R from Mission St. Busses are also providing special service between Daly City, Balboa Park, and Glen Park stations.

At around noon, service was restored between Montgomery station in San Francisco and all East Bay stations.

BART service has been restored between Montgomery station in SF and all East Bay stations. All stations between Powell St and Millbrae remain closed. Passengers travelling between Powell station, Millbrae, and SFIA continue to use bus service provided by SFMTA and SamTrans.
— SFBARTalert (@SFBARTalert) September 13, 2020

After service was restored, BART tweeted that due to maintenance, Downtown San Francisco trains will be using only one track between Powell St and 16th St/Mission. The agency advised the public to expect delays.

Due to scheduled track maintenance in downtown San Francisco trains will be using one track between Powell St and 16th St/Mission. Expect up to 20 minute delays in service toward the East Bay from 24th St/Mission as well as from Montgomery St. in the SFO Airport direction.
— SFBARTalert (@SFBARTalert) September 13, 2020

No further details have been released.