BART trains were running through San Francisco about 20 minutes behind schedule this afternoon, a transit dispatcher said.

Trains on the Pittsburg/ Bay Point Line to San Francisco International Airport and Millbrae were running late due to a previous mechanical problem on a train at West Oakland Station, the dispatcher said.

There was no immediate estimate as to when trains would be back on time.

Please make sure your comment adheres to our comment policy. If it doesn't, it may be deleted. Repeat violations may cause us to revoke your commenting privileges. No one wants that!