BOSTON (CBS) – There were significant delays on the Framingham/Worcester Commuter Rail Line after a train derailed Thursday afternoon, damaging a short section of track. The MBTA said train 518 from Worcester experienced a “low speed upright derailment” before the Lansdowne station in Boston.

MBTA and Keolis crews are investigating and said, “the derailment was an isolated incident caused by human error, specifically the improper alignment of a switch.”

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There were no riders in the coach that derailed and no injuries have been reported. All trains on the line will experience “significant delays,” and passengers are being told to seek alternative transportation.

Passengers using the Worcester Line Friday morning are asked to plan for an additional 20 to 30 minutes of travel time.

Passengers could be seen getting helped off the derailed train and walking along the tracks.

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Westbound passengers were being bused from South Station to Newtonville Station, where they were placed on outbound trains. Eastbound passengers were bused to South Station.

Some passengers said they were stuck on a train for an hour and a half at Back Bay Station.

“I should be home about an hour ago,” one passenger said. “But I guess it’s one of those things.”

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As of 11:30 p.m. Thursday, the train had not been moved. The MBTA did not say when the train is expected to get back on track. Updates are being shared on the Commuter Rail’s Twitter feed.