BART temporarily cut service between San Francisco and the East Bay because of a gas leak in West Oakland on Thursday afternoon.
Service was restored at 3:19 p.m., about 30 minutes after it was halted in both directions.
Although trains were again moving, BART warned that there would be "major delays"
"This is due to a PG&E gas pipeline leak that is near the West Oakland station," said BART spokeswoman Anna Duckworth. "The Oakland Fire Department is responding to this."
PG&E tweeted that its crews "have stopped the flow of gas and are working safely and quickly as possible to make repairs to a gas line damaged by a third-party construction company."
No passengers were caught in the Transbay Tube during the shutdown, although a train that was not in service needed to be removed, a BART official said.
The train system had already experienced significant delays earlier in the day when a man became trapped under a train in the Embarcadero station. He was alive when emergency workers removed him, but his condition is unknown, BART officials said.
Melissa Culross contributed to this report.
