Karangahake Gorge, the East Coast Main Trunk Railway used to run through the gorge until it was bypassed by the Kaimai Deviation - and the Karangahake Gorge section is now a combined walkway and cycleway, part of the Hauraki Rail Trail. Come and join me on this walk.
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https://www.youtube.com/watch?v=XdrD3HwL7AU