Shortly before 7:30, a stopped Green Line trolley at Park Street rolled backward and hitched to the trolley behind it, officials said.

The MBTA partially shut down service on the Green Line in Boston because a trolley rolled back into the trolley behind it at Park Street.

An MBTA Green Line trolley parked at the Park Street station collided with another trolley behind it Wednesday evening, NewsCenter 5 has learned. The incident happened just before 7:30 p.m. Wednesday.

The MBTA partially shut down service on the Green Line in Boston because a trolley rolled back into the trolley behind it at Park Street. WBZ-TV's Brandon Truitt reports.