Four months after six new Orange Line cars were debuted, officials with the Massachusetts Bay Transportation Authority have taken them out of service to investigate an "uncommon noise."
The noise was coming from the underside of the new cars, MBTA Deputy Press Secretary Lisa Battiston wrote in an email.
"With safety as a top priority and out of an abundance of caution, the decision was made to temporarily remove the new cars from service to investigate the issue, any potential impacts, and deploy a fix, if needed," Battiston wrote. "We anticipate the issue to be resolved soon with the cars back in service following this investigation, which is currently taking place."
The cars, which debuted back in August, are more spacious and have wider doors and updated safety features.
The MBTA plans to replace its entire fleet of 152 Orange Line vehicles by the end of 2022 as part of a $2 billion revamp for both it and the Red Line.