What caused the Tangiwai rail disaster on Christmas Eve 1953, killing 151 people?
Answer and explanation
Correct answer: B. A Mount Ruapehu crater lake lahar washed away the Whangaehu rail bridge moments before the express train arrived
- Step 1: An ice barrier at Mount Ruapehu collapsed, sending a torrent of volcanic mud and water down the Whangaehu River. Step 2. The flash flood swept away bridge piers, causing the locomotive and five carriages of the express train to plunge into the raging river. Answer: A Mount Ruapehu crater lake lahar washed away the Whangaehu rail bridge moments before the express train arrived. Why not the others: It remains New Zealand's worst railway disaster.
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