Massachusetts Bay Transportation Authority (MBTA) announced that new Orange Line cars made by Chinese state-owned company CRRC were again out of service.

According to ET, MBTA said that a new Orange Line train faced a mechanical problem in one of the train’s “multiple braking units” on May 19. 

Boston Globe cited officials saying on Jun 21 that MBTA stopped all of its new but troubled Orange Line trains because of “battery failure” on one of the cars.

MBTA said on Twitter, “While we work to determine the exact cause of the failure, we are proactively removing all new Orange Line trains from service out of an abundance of caution.” 

New Orange Line cars made in China have long revealed quality problems. Up until this incident, the new cars have failed at least four times since they started being used in 2019.

The first time, on Sep 20, 2019, a door on a new Orange Line car suddenly opened while the train was in operation.

The second time, two months later, a new Chinese train derailed as it ran slowly back to the Wellington Rail Yard maintenance facility. 

The third time, on March 3, 2020, because of “a fault with the bolsters”, MBTA was once again forced to temporarily stop the new trains produced by the Chinese company.

The fourth time, the trains were pulled from service on March 16, 2021, due to a derailment near Wellington Station.

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