Commuter rail lines north of Boston were delayed this morning due to an electrical problem with the signal system of a drawbridge at North Station, said Scott Farmelant, spokesman for the Massachusetts Bay Commuter Railroad Company.
Twelve trains were delayed for five to 15 minutes, he said.
Farmelant said the cause was a blown fuse in the signal of the drawbridge over the Charles River.
The issue arose after peak morning service and was reported fixed as of 10:45 a.m., he said.
The MBCR operates commuter rail for the MBTA.