Why was the light red? Was it even red? Confusion around Wellington derailment
Monday, 8 June 2026
A Wellington train derailment happened after a signal was triggered when it appeared the driver had missed a red light – on a day there was possibly no need for a red light at all.
Six people, including children and two crew, were injured on Saturday evening when a Johnsonville to Wellington train went into a short run-off area and hit a concrete block - installed in 2025 as a last-stop safety measure. Had the block not been there, the train could have continued on to Khandallah properties, Greater Wellington Regional Council chairperson Daran Ponter had said earlier.
“The thing to ask is, why was the light red?” said Rail and Maritime Union general secretary Todd Valster.
The north and southbound trains usually crossed over on Saturdays in Ngaio, when just two trains worked the line. Khandallah, where the incident happened immediately south of the station, is four stops north of that.
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Valster said the train unit suffered the worst damage he had seen inflicted on a Matangi train, which was no more than 15 or 16 years old, and said it would be written off. The driver and train manager were both injured but recovering. Three children on the train were also recovering but he did not know the state of the sixth victim.
Valster, backed by Ponter, said the incident was being misclassified as a derailment. The real issue was that the train was sent down a run-off area after it was triggered to have gone past a red light.
It hit a concrete block - in place to stop runaway trains - and that caused the derailment, Ponter said.
The northbound train, which departed Wellington at 7.02pm on Saturday, was four stops south at Ngaio, where it was held, when the incident happened at Khandallah.
Ponter confirmed the train had only entered the runoff area because the system detected a red‑light overrun — though it was not yet clear whether the red had actually been run or whether a fault had triggered the alert.
While there could have legitimately been a red light, it would have likely been unnecessary as train movements were light on Saturday on the single-track Johnsonville to Wellington line.
The Transport Accident Investigation Commission (TAIC) would have access to all braking and acceleration data from the train.
KiwiRail said in a statement the removal of the train was still being planned.
But key questions – whether all signals on the line working properly on Saturday, and whether there were any faults reported on the line – were part of an investigation “and it is important to let that investigation run its course”.
A statement from TAIC said relevant agencies would be alerted if the investigation found any safety matter needing immediate action prior to the investigation release. Rail inquiries usually took about 18 months.
“TAIC’s investigators will be considering the state of the signals and all other track infrastructure, environmental conditions, mechanical examination, electronic records, vehicle data recorders, what the train was doing at the time, and all human factors,” the TAIC statement said.
Waka Kotahi NZTA land transport director Mike Hargreaves confirmed the agency was also investigating but could not say how long that would take.