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Two trains collide outside South Station, causing derailment, delays

Two trains collided outside South Station Tuesday night around 8 p.m., causing a Fairmount commuter line train to derail and triggering delays to other commuter lines, officials said.

No injuries were reported to the four passengers aboard the commuter train or to MBTA crews, according to Tory Mazzola, spokesman for Keolis Commuter Services, the private company that runs the commuter rail system for the MBTA.

“An out of service train was leaving the yard when it made contact with a passenger train on the Fairmount Line,” Mazzola said. “This Fairmount train had four passengers onboard, and this incident caused at least three coach cars to derail. There are no injuries and the incident is under investigation.”

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As of 11:40 p.m., Mazzola said it was “too early to tell” if the derailment would hamper Wednesday morning’s commute.

Photos and videos from local media showed a commuter line train askew on the tracks Tuesday night.

The Middleborough/Lakeville, Kingston/Plymouth, and Greenbush line trains were experiencing delays because of the incident, which was described in an earlier statement as a “low speed upright derailment.”

A shuttle bus replaced train service for the 11 p.m. Fairmount train between South Station and Readville, according to the MBTA. Earlier in the night, Fairmount trains began and ended at Newmarket, with a shuttle bus running between Newmarket and South Station.

Crews were on the scene Tuesday night, and Mazzola said that, depending what was needed, workers could use large pieces of equipment such as a crane or smaller pieces of equipment to get the train back on the tracks. Infrastructure such as the rails, track bed, and rail ties will be re-inspected, he said.

Tuesday night’s derailment comes a week after a derailment on the Rockport/Newburyport line last Tuesday snarled the morning commute for some passengers. In that incident, riders coming in from north of Boston were delayed after an MBTA locomotive derailed at low speed near the Somerville train yard at around 7 a.m. with about 300 passengers aboard.

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No one was injured, but the incident triggered a slowdown that affected riders on the Haverhill and Newburyport/Rockport lines.

For the latest commuter rail updates, visit @mbta_cr.


Danny McDonald can be reached at daniel.mcdonald@globe.com. Follow him on Twitter @Danny__McDonald.