The Whangaehu River near the Tangiwai Train Disaster Memorial after a lahar from the crater Lake of Mount Ruapehu, in the central North Island, New Zealand, Sunday, March 18, 2007.

The Whangaehu River near the Tangiwai Train Disaster Memorial after a lahar from the crater Lake of Mount Ruapehu, in the central North Island, New Zealand, Sunday, March 18, 2007.

A train passes over the Tangiwai Bridge over the Whangaehu River at the scene of the historic Tangiwai Rail disaster after a lahar from the crater Lake of Mount Ruapehu, in the central North Island, New Zealand, Sunday, March 18, 2007.

The Tangiwai Bridge road bridge over the Whangaehu River after a lahar from the crater Lake of Mount Ruapehu, in the central North Island, New Zealand, Sunday, March 18, 2007.

The Tangiwai Memorial beside the Whangaehu River after a lahar from the crater Lake of Mount Ruapehu, in the central North Island, New Zealand, Sunday, March 18, 2007.

The Tangiwai Bridge over the Whangaehu River with the Tangiwai Rail Disaster Memorial in the foreground after a lahar from the crater Lake of Mount Ruapehu, in the central North Island, New Zealand, Sunday, March 18, 2007.