NBC Boston: “MBTA Green Line service has been suspended on the B Branch because of a collision between two trolleys near Babcock Street that left more than 20 people hurt, officials said. None of the 23 injuries were thought to be life-threatening, according to the Boston Fire Department and Emergency Medical Service, which were two of the agencies at the scene of the crash on Commonwealth Avenue near Boston University. Train service on the branch was suspended between Packard’s Corner and Kenmore, according to the MBTA. Shuttle buses were replacing trolleys between Kenmore and Washington Street. It wasn’t immediately clear what caused the crash, and MBTA General Manager Steve Poftak didn’t want to speculate as the investigation began. ‘We will obviously get to the bottom of this. This should not happen and we will find out why it happened and will ensure that it won’t happen again,’ he said Friday evening.”