Mechanisms identified in Hitachi cracks crisis

Stress corrosion and fatigue affect Class 80x fleets, says ORR report

The Office of Rail and Road’s interim report into cracking issues affecting Hitachi Class 800-802 trains says stress corrosion cracking affected lifting plates, while fatigue cracking was the mechanism for cracks in yaw damper mountings. While communications between affected parties are generally regarded to have been effective, some concerns have been raised.

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