Tangiwai disaster 70th anniversary
b"On Christmas Eve 1953, 151 passengers lost their lives when a train travelling between Wellington and Auckland derailed into a river in Tangiwai. It is still New Zealand's worst rail disaster.\\nThis Sunday is the official ceremony to mark the seventieth anniversary of the disaster.\\nJohn Mahy was on the train that night, and narrowly avoided being in one of the carriages that fell into the river.\\nHe spoke to Ben Strang."