Authorities are investigating a low-speed collision between Amtrak and commuter rail trains in South Boston on Wednesday afternoon, officials said.
The collision took place under the West Fourth Street bridge about 12:50 p.m., near the Southampton Street maintenance facility. No passengers were aboard either train, and no injuries were reported.
The impact derailed and damaged the Amtrak train, a law enforcement official briefed on the investigation said.
As of late Wednesday afternoon, one track remained out of service, but “thus far, there have not been significant delays getting passengers home,” said Mac Daniel, spokesman for Keolis Commuter Services, which operates the commuter rail for the MBTA.
Joe Pesaturo, spokesman for the Massachusetts Bay Transportation Authority, said an Amtrak train was proceeding out of a maintenance facility and was being followed by a Keolis commuter rail train.
“The Amtrak train was stopped at a signal when the slow-moving commuter train made contact with the rear of the standing Amtrak locomotive,” Pesaturo said.
Steve MacDonald, a Boston fire department spokesman, said the two trains tapped each other, and firefighters responded to assess the scene.
Daniel said both trains were taken to a maintenance yard for examination.
Amtrak Police and Transit Police are investigating the incident.