Green Line Extension back in service as feds, state continue to investigate Lechmere derailment

The MBTA says it's once again running trolleys north of North Station, even as the National Transportation Safety Board, the Federal Transit Administration and the state Department of Public Utilities continue to investigate how the front wheels of one trolley came off the tracks Tuesday afternoon, sending six passengers to the hospital.

Service resumed at 10:30 a.m., the T says.

The necessary repairs have been made and a test train successfully operated through the area earlier this morning.