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Orange Line trains back in service after braking issue
![A new Orange Line train. The MBTA said it plans to replace the line's entire fleet by 2022. (Courtesy MBTA)](https://wordpress.wbur.org/wp-content/uploads/2019/08/0814_orange-line-1000x667.jpg)
The MBTA's new Orange Line trains are back in service as of Monday morning.
The six-car trains were taken off the tracks last week after one of them had a problem braking.
Engineers found a bolt in one of the train car's braking units was improperly installed, the T said.
No problems were found in any other train cars.