The branch started as a
tramway when the Awamoko Tramway Company was formed in 1873. Construction of a tramway from the
Main South Line at
Pukeuri to
Duntroon commenced the next year with approval from the
Otago provincial government. In 1875, after the realisation that tramway standards were not sufficient for the line's purposes, an upgrade to railway standards commenced. Almost everything that had already been constructed had to be rebuilt; the rails were too light, the
sleepers were too small, and insufficient
ballast had been laid. Nonetheless, only a fortnight after reconstruction began, the official opening ceremony took place on 1 December 1875. Freight trains did not begin running for another three weeks, and passengers were not carried until 16 August 1876, when the reconstruction programme had been completed. The line had not reached Duntroon; it terminated on the opposite (east) bank of the
Maerewhenua River due to bridging difficulties. The Duntroon and Hakataramea Railway Company was formed in 1878 after the 1877 District Railways Act was passed, with the intention of building a railway from Duntroon to
Kurow and then further up the Waitaki Valley. Construction commenced in 1879, the Maerewhenua River was bridged on 2 July 1881, and when the
Waitaki River was bridged on 7 November 1881 the line was completed to
Hakataramea, 1.76 km beyond Kurow by rail on the northern side of the Waitaki. There were plans to extend to a proposed town that was to have 10,000 residents, but the town never came to fruition and Hakataramea remained the terminus. The Duntroon and Hakataramea Railway Company did not purchase its own equipment; the branch was always operated by the
New Zealand Railways Department. This arrangement lasted for over three years while the company and government disputed ownership, primarily due to the fact the line terminated at Hakataramea rather than being built to the full extent of original plans. The government purchased the line in April 1885 and charged a tariff beyond Duntroon until 1897. Further construction took place in 1928, when the
Public Works Department built 6.4 kilometres of railway from Kurow to the site of the
Waitaki hydro-electric dam. This line was never owned or operated by NZR, though NZR trains did occasionally use it, when a Public Works Department locomotive took over from Kurow. Works and freight services began on 20 December 1928 and passengers were carried from 25 February 1929. == Stations ==