New Orange Line MBTA Trains Back In Service

BOSTON — All new Orange Line trains are back on the tracks Monday morning after crews worked for four days to test out the braking systems when one car failed last week.

Last Thursday, a new Orange Line train experienced a problem in one of the train's forty-eight braking units, and it went disabled, a spokesperson from the MBTA said.

There were no reported injuries, but out of an abundance of caution, the MBTA removed all new cars from service while engineers and technicians worked to determine what caused the problem.

A preliminary investigation found that one bolt in one of the car's eight braking units had not been properly installed at the manufacturing plant, an MBTA spokesperson told Patch.

Maintenance personnel worked to launch a fleet-wide process to make sure each bolt was properly installed. There were 24 bolts per car and 144 bolts per train, and the issue was not found in any other braking units.

"The MBTA is grateful to its customers for their patience while the vehicle engineering team worked to ensure that the new cars are performing in a safe and reliable manner," the MBTA said in a statement.

Thursday's decision to pull the trains comes as federal transportation officials have started reviewing MBTA safety measures in the wake of the death of an MBTA Red Line train passenger who got his arm caught in a subway door and was dragged at least 100 feet last month.