Officials say 10 people were injured, and nine were transported with non-life threatening injuries, when a Green Line subway car derailed in a tunnel near Kenmore Square around 11 a.m. Saturday.
The operator of the train was one of those injured.
There were a total of 150 passengers on the train at the time of the derailment, MBTA General Manager Steve Poftak said at a press conference Saturday afternoon.
Emergency workers said they were told by witnesses that everything went dark and they were thrown around the train car.
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According to the Massachusetts Bay Transportation Authority, passengers should expect major delays. They are now advising people to seek alternative transportation.
The Green B Line is running normal service in both directions. The Green C Line has shuttle buses replacing eastbound service from Cleveland Circle to Kenmore, and westbound service will run from North Station to Kenmore. The Green D Line eastbound service will terminate at Fenway, and westbound service will terminate at Kenmore. Shuttle buses are replacing service from Kenmore to Fenway.
Regular service is expected to resume Sunday morning.
The cause of the derailment is under investigation.
The last Green Line derailment happened on Feb. 5, the day of the Patriots parade. That accident is still under investigation.