Two trolleys collided in Boston.
The "slow-speed" crash happened at Boylston Street Station.
The station was closed as officials attended to the injured.
As many as 20 people were being evaluated.
Many of the injured reported back and neck pain.
Officials said the trolleys were not damaged.
It was not clear what caused the crash.
It happened at about noon.
Six people were taken to local hospitals.
The operator of the second train was among the injured, MBTA officials said.
Tripadvisor Traveler Photo via CNN
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