Executive summary
Between Friday 5 November 2004 and Monday 21 March 2005, there were 4 freight train derailments at various locations as a result of failures of roller bearing units. These failures occurred on varying wagon classes and bogie types.
There were no injuries in any of the incidents.
Because of the similarities arising from each derailment, the investigations into all 4 incidents have been combined into one report.
Safety issues identified included:
· the reporting and tracking of component replacement
· the abnormally high incidence of fused brake blocks on the derailed wagons.
Two safety recommendations were made to the Chief Executive, Toll NZ Consolidated Limited to address these issues.