An ATSB investigation has found that high track temperatures, track stability and the movement of rolling stock led to derailments involving Train 6MP4 at Koolyanobbing WA and Train 6SP5 at Booraan WA on the afternoon of 30 January 2005.
Koolyanobbing and Booraan are respectively about 200 kilometres and 360 kilometres west of Kalgoorlie. Both freight trains had been travelling to Perth on the Defined Interstate Rail Network (DIRN), 6MP4 having started its journey in Melbourne and 6SP5 in Sydney.
There were no serious injuries due to either derailment but many wagons from each train sustained…