Months after a Red Line train operated without a conductor, the MBTA released surveillance videos of the incident.
The videos show the train passing through the Quincy Center and Quincy Adams stations, two of the four stations the train passed through without an operator.
There were 50 passengers on board at the time of the incident but none were injured.
The train was eventually stopped after the T cut power to the third rail.
The driver of the train, David Vasquez, was fired after an investigation revealed he tied the cord around the "dead man's switch" in the conductor's cab while he went to access the emergency brake.
This triggered the train to take off.
MBTA General Manager Frank DePaola issued a statement following the release of the video that said they "took immediate steps to prevent such an incident from ever happening again."
DePaola added that new protocols were put in place following the incident such as "requiring a supervisor be present when a train operator is granted permission to 'bypass' a faulty signal."
An order was also issued reminding all operators of the rules against tampering with safety equipment.
According to the MBTA, operators must obtain permission from a dispatcher to bypass a faulty signal and a supervisory person must be present before the train can proceed.
Before the operator places the train on emergency bypass, an MBTA Official must be present to observe the operator's actions.
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The dispatcher must then walk the operator through the emergency bypass procedure.
