Coal train derails near Otira Tunnel, halting Midland Line traffic

The Transport Accident Investigation Commission has opened an inquiry into a coal train derailment that shut down the Midland Line early Wednesday. The accident occurred around 10 p.m. Tuesday near the Otira Tunnel, forcing a full closure of the route between Rolleston and Greymouth.

A KiwiRail coal train was traveling toward Christchurch when the final wagon left the tracks. The train came to a stop inside the tunnel, causing extensive damage to both the rolling stock and the rail infrastructure. No crew members were injured in the incident.

Lynne Morton, KiwiRail's engineering manager, said her team is currently assessing the scope of the repairs. She noted that the company is working to restore the line as quickly and safely as possible. Wednesday's TranzAlpine service will only run as far as Arthur's Pass, with further disruptions likely over the next few days.

Morton added that affected passengers will receive direct contact regarding rebooking or refund options. Replacement buses will be arranged where feasible, and KiwiRail is coordinating with freight customers to manage the logistics disruption.

Louise Cook, chief investigator of accidents at TAIC, confirmed that a team has been appointed to gather evidence. Investigators are expected to remain on site for two to three days. Their initial focus is examining and mapping the train and the scene while evidence is still available.

The investigation will include inspecting the locomotive and rail infrastructure, securing maintenance records, and interviewing the train crew and other operator staff. Cook stated that the goal is to identify lessons that can improve transport safety and help prevent future accidents.