 The track crosses three big viaducts — the largest, the Percy Burn is thought to be one of the biggest wooden viaducts in the Southern Hemisphere and is referenced in Warren Bird's book "Viaducts Against the Sky".The Waitutu area was visited by early Māori in search of food from the sea, rivers and forests.Kaika or hunting camps were sited on the banks of the Waiau River, near Tuatapere, and the river crossed by mokihi or rafts.