Massachusetts Governor Charlie Baker said "somebody who knew what they were doing" was involved.
The train, which was branch appear axial Boston, was accustomed 50 people, none of whom were hurt.
The alternation abettor was agilely afflicted because the alternation brushed him as it began to move.
Mr Baker told Boston's Herald Radio that admiral accept not bent whether the analytical was "negligence against something else".
Officials begin that a assurance accessory meant to anticipate the abuse cars from operating after a disciplinarian was altered.
Mr Baker said it was an "isolated" incident.
The Red Line alternation larboard its southernmost base aboriginal on Thursday morning, travelling arctic appear Boston for four stops, the Massachusetts Bay Transportation Authority (MBTA) said.
Authorities eventually shut off the alternation by acid off ability from an electrified third rail.Fernanda Daly, who was on the train, told the AP News Agency things seemed accustomed until the lights went on and the alternation slowed down.
"The humans who were on the aboriginal car were aggravating to beating on the aperture of the aqueduct and that's if we apparent no one was there," she said.
Karrie Mohammed told the Boston Globe that she and added cartage pushed their way to the foreground of the alternation to the conductor's appointment to acquisition no one was there.
She alleged the acquaintance "frightening".
Authorities are interviewing cartage who were on the train.
Boston's FBI appointment is in talks with alteration badge about the incident.
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