Driverless MBTA train carrying 50 travels through 4 Boston stops

A six-car train with passengers on board left a suburban Boston transit station without a driver Thursday and went through four stations without stopping. Secretary of Transportation Stephanie Pollack said Thursday that before the train left the Braintree station, the operator got off the train to execute a procedure that allows it to travel if there is a signal problem. Operator error is the current focus of the investigation.
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