The Transport Accident Investigation Commission (TAIC) has published an interim report as part of its ongoing investigation into the disablement of a TranzAlpine passenger train in a tunnel near Springfield on 30 May 2026.
The Christchurch to Greymouth service, was travelling through Tunnel 9 on the Midland Line about 10km north of Springfield, when it stopped, unable to proceed at 9:47am.
It remained in the tunnel for about an hour and was able to restart briefly, exit the tunnel and stop safely awaiting support. None of the crew or the 177 passengers were harmed and the train was safely towed back to Christchurch.
TAIC Chief Investigator of Accidents Louise Cook says the Commission has so far established that an engine fault led to overheating in the electrical system. The train lost power, slowed and eventually stopped.
The locomotive engineer secured the train and shut down the locomotive. An emergency was declared and a locomotive from a freight train at Springfield was sent to recover the train.
“We are still collating and verifying evidence directly related to the engine fault that caused the disablement as well as pursuing several wider systemic lines of inquiry.”
A full report will be released once the investigation has been completed with final findings, causes, safety issues and recommendations.
Read the interim report: taic.org.nz/inquiry/ro-2026-104