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A coach “became unattached” from an MBTA commuter rail train near South Station, essentially plugging up South Station rail service for an extended time during the Monday morning commute, according to Keolis Commuter Services and other agencies.

Outbound Foxboro train 743 became disabled around 7:35 a.m. Monday, Keolis tweeted on its official account. Keolis operates the MBTA commuter rail system under a contract with the T. The tweet, which was posted around that time, did not provide details on the cause.

However, in an e-mail, Keolis spokesman Justin Thompson wrote that the coach carrying 10 passengers separated from the next car in the train.

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“Outbound Train 743 experienced a mechanical issue leaving South Station that caused a coach car to become unattached from the train,’’ he wrote. “The train’s safety features were working correctly and the train came to a complete stop.“

He wrote that 10 passengers on board the “unattached” coach car were transferred to another train.

The incident was not weather related and is not expected to impact the Monday evening commute, according to Keolis.

But it did disrupt the morning travel. AMTRAK reported an Acela train was 30 minutes behind schedule because it could not get out of South Station due to the disabled T train. Other commuter trains from Providence were also delayed until the disabled train was moved off the active tracks.


John R. Ellement of the Globe Staff contributed to this report. Travis Andersen can be reached at travis.andersen@globe.com. Follow him on Twitter @TAGlobe.