Freight rates for shipping iron ore from Australia to China have dropped by more than 10% since Monday as the derailment of one of BHP’s trains is disrupting shipments from Port Hedland.

The Australian mining giant was forced to derail the train after it ran away when the driver was out conducting an inspection.

The train travelled for 90 km by itself before being derailed near Turner, approximately 120km south of Port Hedland, leaving about 1.5km