Green Line remains shut north of North Station as MBTA, feds investigate Lechmere derailment

The MBTA reports this morning it is running shuttle buses along the Union Square and Medford/Tufts branches of the Green Line Extension as it continues to investigate yesterday afternoon's derailment near Lechmere that sent six people to the hospital.

The National Transportation Safety Board announced it has sent a team of investigators to Cambridge to also try to figure out what failed and made the front wheels of a trolley slip off the rails.