Today's collision between two Green Line trolleys in Newton is not the first time in recent months that trolleys on the line have been involved in accidents.
A trolley on the B branch derailed and caught fire May 14 on Commonwealth Avenue near Chestnut Hill Avenue, disrupting service and damaging the trolley and track but causing no injuries.
In February, a passenger was injured when a trolley on the B branch collided with a truck at Commonwealth Avenue near Cummington Street.
In December, nine people received minor injuries when a trolley crashed into another one ahead of it at Boylston Station.
In September, a trolley and a flatbed truck collided on the C branch near Coolidge Corner, leaving the truck driver and three passengers with minor injuries.