Raurimu Railway Spiral
Why are you reporting this puzzle?
Railroad - part of the NZ Main Trunk. North Island. Required to gain 132 m (433 ft) in 2 km (1.6 miles) a complex set of curves and 2 small tunnels managed to drop the gradient to 1 in 52!
Design solution found by Robert Holmes in 1898 - Main Trunk opened fully in 1909.
Design solution found by Robert Holmes in 1898 - Main Trunk opened fully in 1909.
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