Driverless train travels through several Boston-area stops

In a statement, the Federal Bureau of Investigation said it was aware of the incident and has been in contact with MBTA Transit Police.

There, T personnel boarded the train and moved it up one stop to the JFK/UMass station, where passengers were asked to disembark the train.

Daly said some passengers even tried to break the windows to get out – until T officials came on board to explain the situation.

MBTA General Manager Frank DePaola said in a statement he plans to get to the bottom of what happened.

Officials are looking into the possibility a safety device was tampered with, allowing the train to proceed without an operator.

Commuters were unsettled Thursday – after an MBTA train left the Red Line station in Braintree without an operator.

The trip began shortly after 6 a.m.at the Braintree station and ended about nine minutes later when power was cut to the rails, transportation officials said.

The train continued to roll through Quincy Adams, Quincy Center and Wollaston stations and stopped just past North Quincy.

The Red Line train was taken to the MBTA’s Cabot Yard’s facility and will remain impounded during the investigation.

A passenger on the train told CNN Boston affiliate WHDH that the lights went out and the train eventually stopped. The driver has been with the MBTA for more than 28 years, he said.

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He said he believes it was an isolated incident.

Pollack said the investigation would also examine whether the conductor properly deployed two sets of brakes before leaving the controls to put the train in bypass mode – a fairly common practice, according to officials.

Massachusetts Gov. Charlie Baker says a passenger train carrying 50 people that left a suburban Boston station without a driver was tampered with. “The operator left the train to execute that procedure”.

Baker said his administration is working with law enforcement on the investigation. An initial examination showed no problems with the “functionality” of the train’s equipment, he said. Baker later told reporters that there was still a question of “negligence versus something else”.

“If that occurred, it would be a prohibited act”, she said.