An issue on the track of the MBTA's Red Line led to shuttle buses replacing service in Dorchester Tuesday evening.
The MBTA said in a tweet around 5 p.m. that the shuttles were running between Ashmont and Fields Corner because of a track problem. The agency later told NBC10 Boston the disruption was due to a broken rail.
Service was disrupted in both directions, with trains continuing to run on the southbound track between JFK/UMass and Fields Corner, the MBTA said.
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Regular service has resumed, the MBTA announced shortly after 8 p.m.