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Raurimu Spiral
The Raurimu Spiral is a single-track railway spiral, starting with a horseshoe curve, overcoming a height difference, in the central North Island of New Zealand, on the North Island Main Trunk Railway. It is a notable feat of civil engineering, having been called an 'engineering masterpiece'. The Institute of Professional Engineers (NZ) has designated the spiral as a significant Engineering heritage site.〔(IPENZ )〕
== Background ==
During the construction of the central section of the North Island Main Trunk railway between Wellington and Auckland, a major obstacle was faced - how to cross the steep slopes between the North Island Volcanic Plateau to the east and the valleys and gorges of the Whanganui River to the west.
South of Taumarunui the terrain is steep but not unmanageable, with the exception of the stretch between Raurimu and National Park, where the land rises too steeply for a direct rail route. A direct line between these two points would rise in a distance of some , a gradient of 1 in 24.
The area was thoroughly surveyed during the 1880s in an attempt to find a route with a lesser grade, but the only viable possibility seemed to require a detour and nine massive viaducts. Even then, the gradient would have been over 1 in 50.
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