The Dun Mountain Railway was a privately owned and operated 3 ft (914 mm) narrow gauge, 21.5 km (13.4 mi) long horse-drawn tramway from chromite mines in the vicinity of Duppa Lode on the eastern slopes of Wooded Peak to Nelson port in the Tasman District of New Zealand's South Island. It operated from 3 February 1862 to 30 May 1901, with the last mineral traffic on the incline section operated in January 1866.