Tangiwai was a station on the North Island Main Trunk line, in the Ruapehu District of New Zealand. The station served the settlement of Tangiwai. The nearby pulp and saw mills are now one of the main sources of freight on NIMT. In 1953 the Tangiwai disaster occurred when the nearby bridge over the Whangaehu River was swept away. Tangiwai has one of four substations supplying power to NIMT's electric trains.