RailCorp’s acceptance testing regime for tail pins did not identify that the tail pins stamped BU 06 04 were below standard and, hence, not suitable for service.
The ATSB is satisfied that the action taken by RailCorp to improve their acceptance procedure addresses this safety issue.
RailCorp has revised the engineering drawing for the XPT tail pin. The drawing now specifies forged components and states that; Charpy, tensile strength, chemical composition, surface finish, hardness tests, and quality control testsare required. Additionally, RailCorp hascommenced fatigue, fracture mechanics and fracture toughness tests on the new forged tail pins to determine
theperiod at which mandatory tail pin replacement should occur.
