- Associated Press - Monday, September 16, 2019

BOSTON (AP) - Boston public transit authorities say a broken axle was to blame for a subway train derailment this summer that caused commuter disruptions and criticism of the system.

Jeff Gonneville, deputy general manager of the Massachusetts Bay Transportation Authority, said Monday that the investigation concluded that metal pieces that surround the axle did not function properly and allowed electrical sparks to arc to the axle for about six months, making it weak and brittle until it broke.

No one was injured when the third car of the Red Line train went off the tracks June 11 as it pulled into the JFK/UMass station. The derailment caused major damage to the automatic signals and switches along a stretch of track.

Gonneville says T workers are checking all subway cars for similar problems.

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