MEDFORD, Mass. (WBZ NewsRadio) — With new Red and Orange Line trains returned to regular service, the Massachusetts Bay Transportation Authority released video surveillance footage of the root cause for concern that brought trains out of circulation in the first place.
The timestamp on the video shared by the MBTA to WBZ-TV is just before 4 a.m. on June 20, and shows a bright flash bursting within Wellington Yard in Medford. Officials say the light came from a battery explosion on an out of service Orange Line train, and it's the reason new Red and Orange Line model cars were removed from their regular commute while maintenance and inspections could be conducted.
The MBTA says the problem was identified to be battery failure resulting from temperature sensing circuitry that caused an overcharge. Officials said the battery issue was fixed, and trains were brought back to the running rails on July 4.
The month before, new train models were pulled from service because of a braking problem.
WBZ's Shari Small (@ShariSmallNews) reports.