The train left Auckland four hours late. Authorities had been waiting for reports on rain-swollen areas of the Waikato through which the overnight express would pass, and the decision to send it was not made until 10 pm. The earlier northbound service on the same route had already been delayed by landslips. At 11:25 pm on 5 July 1923, with about 200 passengers aboard, the Auckland-to-Wellington express finally departed - heading south along the North Island Main Trunk line and into a night that would change New Zealand railway safety forever.
Just south of the small settlement of Ongarue, near Taumarunui, the Main Trunk line curved through a cutting in steep hill country. At approximately 5:52 am on the morning of 6 July, the locomotive rounded this bend. Driver A. Stewart had shut off steam at the top of a rise, letting the train roll downhill under its own weight at about 25 to 30 miles per hour. As the curve straightened, Stewart caught a glimpse of what lay ahead.
A landslip had collapsed across the track, triggered by the heavy rain that had been battering the region. Buried in the mass of earth and debris was a boulder roughly 1.5 meters in diameter. Stewart had no time to brake. The locomotive ploughed into the slip and the boulder caught beneath it, dragging along the rails for two or three chains - perhaps 60 meters - before wrenching the engine off the tracks and throwing it onto the bank of the cutting. Behind the locomotive, the first and second carriages telescoped completely, each crushing into the one ahead. The third carriage partly telescoped onto the second. About 80 meters of track was torn up.
Seventeen passengers died. Eleven were killed instantly in the second-class carriages where the telescoping was most severe. Two more died either on the way to Taumarunui Hospital or shortly after arrival. Four others succumbed to their injuries in the days that followed. Twenty-eight passengers were injured. The postal van, positioned between the locomotive and the first carriage, survived almost undamaged; its three postal workers emerged without a scratch.
Driver Stewart suffered a badly scalded arm and bruises to his head and thigh. His fireman, Campbell, was scalded and cut across the nose and ear. The train's guard, H.P. Hobson, was at the rear and unhurt. He sent the sleeping-car attendant walking back along the track to Ongarue to raise the alarm. A relief train from Taumarunui arrived within two hours, carrying rail workers and equipment. The first injured passengers reached the hospital within three hours of the crash; the last arrived shortly after noon. The Christchurch Press observed that until this moment, no railway accident in New Zealand had ever killed more people than a single overturned motor car.
The wreckage nearly became an inferno. New Zealand Railway carriages were lit by Pintsch gas - cylinders of compressed gas that fed mantled lamps throughout each car. When the carriages telescoped, some of these cylinders ruptured and the escaping gas ignited. Flames began to consume the wreckage where passengers were trapped. Then, with a timing that survivors could only call providential, a second landslide of soft papa clay slumped across the burning carriages, smothering the fire before it could spread.
The near-catastrophe forced a reckoning that had been deferred for a decade. Back in 1914, the NZR General Manager E.H. Hiley had investigated the cost of electric carriage lighting and concluded that gas was adequate 'for comfort.' When the new Minister of Railways, Gordon Coates, learned of the crash and reviewed the file, he ordered the immediate replacement of gas lighting on important passenger trains, beginning with the overnight Main Trunk expresses. By the end of the 1926-27 financial year, 173 carriages had been converted to electric lighting, with 160 more scheduled for the following year.
The three-man board of inquiry released its findings on 30 August 1923, having heard evidence from 51 witnesses. The board concluded that the landslip was likely still falling as the train approached, and that the boulders embedded in it were the direct cause of the disaster. No railway official was found guilty of neglect.
But the inquiry's most lasting impact was on the technology of railway travel itself. Beyond the carriage lighting overhaul, locomotive headlights were also upgraded. Previously, engines carried inadequate lamps fueled by acetylene from calcium carbide - barely sufficient to illuminate the track ahead. After Ongarue, electric headlights powered by Pyle-National steam turbogenerators became standard. By the end of the 1923-24 summer, most North Island express trains were so equipped. Two years later, when a derailed Napier Express at Opapa again ignited gas lighting, the upgrade program was accelerated further. A century after the disaster, in July 2023, a memorial was unveiled near Ongarue to commemorate the seventeen passengers who died - the forgotten victims of a crash that quietly revolutionized railway safety in New Zealand.
Located at 38.72S, 175.28E, near Ongarue settlement south of Taumarunui in the North Island's King Country region. The crash site is along the North Island Main Trunk railway where the line curves through cuttings in steep, bush-covered hill country. From the air, follow the railway line south from Taumarunui along the Ongarue River valley. The terrain is rugged with deep valleys and forested ridges. Nearest airport: Taumarunui Aerodrome (no ICAO code) approximately 15 km north. The Waikato River and its tributaries provide visual navigation references. Weather in this region is often wet and overcast; the steep terrain can generate localized low cloud and fog, particularly in early morning.