NBC Boston has video of a Red Line train that took off at the Braintree yard and then just kept on going through Braintree station on May 30.
Chris Staiti reports the lead car in the train was the same one in an infamous 2015 incident, in which a Red Line train with passengers on board started heading towards Boston after the operator left the train to deal with signal problems at Braintree.
You may recall, runaway trains in yards was one of the issues the Federal Transit Administration blasted the T for just last week, specifically in this special directive (which includes the May 30 incident):
These events raise serious safety concerns. Failure to properly secure disabled trains, including trains with insufficient brakes or propulsion systems, and failure to properly secure disabled trains in yards and maintenance facilities is a significant safety risk. Disabled trains may not be able to make moves directed by yard dispatchers or other personnel and may not be able to apply required braking or propulsion utilizing routine movement and securement methods, creating an increased likelihood of unintended and uncontrolled movements, resulting in collisions with other trains, equipment, or personnel injuries or fatalities.
In addition, these events amplify the need for clear procedures, training, and supervision on the management of disabled trains to prevent unintended train movement. During the course of the SMI, however, FTA found that MBTA does not have or use specific procedures for yard movements of rail vehicles with known or suspected defective brakes or propulsion equipment. In addition, MBTA does not adequately train personnel on the policies and procedures to safely move and secure rail cars with known or suspected defective brakes or propulsion equipment, nor does it verify that personnel consistently use policies and procedures for movement of trains that do not have working brakes and working propulsion equipment.
Back in 2015:
Red Line train with passengers on board rumbled down tracks without a driver this morning.
Runaway train operator left train to deal with ongoing signal woes at Braintree.