Metallurgical examination of SAB resilient wheel failures (locos 86216 and 86242) (TM-MET-054)

In a previous failure report (contained in Appendix), the fracture of an SAB resilient wheel was found to have been caused by molten copper being deposited onto the wheel web as a result of arcing between copper earthing braids and the wheel. The localised heating associated with this deposition caused...