UPDATE II: BART now running limited service.

UPDATE I: Contrary to what they had initially told us, BART won't be running trains at 4 a.m. Service is expected to run at 6 a.m.

BART and the two unions have reached a tentative agreement Monday night, effectively ending the BART strike! A BART spokesperson says trains will start running again tomorrow by 4 a.m. "with reduced capacity." By day's end, however, trains will run on regular schedule.

KGO has the details:

BART and negotiators from ATU and SEIU are meeting at the Metropolitan Transportation Commission headquarters in Oakland. Monday evening, Oakland Mayor Jean Quan and Lt. Gov. Gavin Newsom arrived at the building and sources tell ABC7 News that an announcement could be coming.

A BART spokesperson had said earlier in the day they had hoped to reach a deal by 6 p.m. so they could have trains running by the Tuesday morning commute. BART says it will take 16-18 hours to get operations back online.

“We are pleased to announce that we have reached a tentative agreement with union leadership that will bring the trains back into service, starting tomorrow, while union members consider the agreement and vote on it," BART General Manager Grace Crunican said in a written statement. "This is a good package for our union members while still allowing the District to make the necessary investments in our infrastructure. That investment is critical to the future of the Bay Area."

BART strike's second act began on Friday. But today commuters felt the pinch as traffic snarled and lines for buses and ferries grew. But come tomorrow, folks, you will once again be able to enjoy the comfort and rapidity that is BART. Lucky you.

And with that...