A computer equipment problem early Friday through the commute into chaos for BART riders, as authorities shut down the entire system for the second time since May.

In a series of social media statements, BART said the computer network issue followed a network upgrade. The agency did not say when the system would be open and urged riders to seek other means of transportation.

Related Articles

It’s the second time since May that BART has closed its entire system. On May 9, BART closed all 50 stations for nearly five hours, because of a network connectivity issue that prevented controllers from seeing train locations on the tracks and made safe operation of the system impossible.

AC Transit and the San Francisco Ferry Service were honoring BART tickets, according to the agency.

The delay

See Full Page