As the Otago gold rush was in full effect around the 1860's through the 1870's there was a huge push to build railways. New Zealand had adopted the Vogel Imprint, a rudimentary standard at the time. Small Tunnels, Narrow lines, Light Iron and wooden trestles. It was only till the end of the 19th century that a lot of what was already built, turned obsolete and left to decay over time. Throughout Otago there is a fair number of old tunnels, this is a hilly land. Lots of these tunnels are now fenced up for safety reasons, land slips and bad design that lead to collapse. Flash lights are a must for these old tunnels, you never know whats lurking inside.Walk towards the light!