On 6 January 2021, freight train 3YN2 was operating between Broken Hill and Newcastle, New South Wales. The crew of train 3YN2 were alerted by the network controller of a possible issue with their train.

The crew then carried out an inspection of the train between Euabalong West and Kiacatoo at 583.500 km. The crew identified that the wagon frame on the 32nd wagon (NDHX1436G) had failed and was resting on the rail. The wagon was loaded with two containers carrying lead (PB) at the time which remained secured to the wagon. There were no reported injuries.

This investigation is being led by the  NSW Office of Transport Safety Investigations (OTSI). OTSI conducts rail investigations in NSW on behalf of the ATSB under the Transport Safety Investigation Act 2003. Investigators have commenced collecting evidence from involved parties.

Should any safety critical information be discovered at any time during the investigation, the ATSB will immediately notify operators and regulators so appropriate and timely safety action can be taken.

A final report will be published at the conclusion of the investigation.