SAN FRANCISCO (AP) — San Francisco Bay Area residents were scrambling Friday for alternate routes after a regional commuter rail system shut down all its trains due to a computer issue, a second systemwide closure for the beleaguered rail line in four months.

The Bay Area Rapid Transit District’s suspension of service started about 5 a.m. following a computer network upgrade, BART spokesperson Alicia Trost said. The trains were still down as of 8 a.m., and there was no estimate time for service to resume, she said.

Software upgrades are done periodically overnight, but Trost said something went wrong Thursday night that has prevented the agency from starting the computer system that dispatches the trains.

Last Friday, smoke from brakes filled a car after a train suddenly stopped inside

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