BOSTON (WBZ NewsRadio) — New cars from the Massachusetts Bay Transportation Authority went back into service Monday after they had to be pulled for inspections related to an instance of battery failure in the Wellington Yard on June 20. An out-of-service Orange Line car was identified to have an out-of-range battery temperature reading, causing the car's battery to overcharge for an extended duration and fail.
Following the MBTA's discovery, all new Red and Orange Line trains were taken out of commission as a precaution until the issue could be addressed.
Officials say that to bring the new cars back, a design change had to be made to increase the airflow in the battery compartment. The fix to the temperature sensing circuits was made, implemented, and tested successfully before the new trains returned for their first weekday service.
"CRRC, the cars’ maker, and the MBTA have worked collaboratively with both the battery and battery-charging system manufacturers to determine the root cause and appropriate corrective actions," the MBTA said in a statement.
In May, the new Red and Orange Line cars had to be pulled for problems concerning the braking systems.
WBZ's James Rojas (@JamesRojasNews) reports.