Proposals for a railway line to Kaitaia and the Far North existed as early as the 1870s, but it was not until 1909 that preliminary surveys were conducted. After the
North Auckland Line was linked to and extended over the
Opua Branch in 1911, construction progressed in earnest from Otiria towards
Kaikohe: initial work had been undertaken in 1910. On 1 May 1914, this section opened. A small amount of further construction took place over the next two years, but
World War I meant that no work took place between 1916 and 1919. The resumption of work led to the completion of the line to Ōkaihau on 29 October 1923. Debate raged over what route to follow to Kaitaia. The proposal was to run from Ōkaihau to
Rangiahua, near the
Hokianga Harbour, and then either through the
Maungataniwha Range, about long with two tunnels; or skirting the range, roughly longer with no tunnels. A 1921 commission did not support work beyond Ōkaihau, but a compromise in 1923 established Rangiahua as the northern terminus and the Public Works Department continued to build northwards, albeit slowly. Due to the
Great Depression construction of the line beyond Ōkaihau was abandoned in 1931. The Rangiahua section was essentially complete: the line wound downhill to the settlement and a station yard complete with platform was built, though the station building itself was not erected. Following a
change in government in 1935, a 1936 review of the work beyond Ōkaihau was undertaken, and the decision was made not to extend the line to Kaitaia. The steep route to Rangiahua was not seen as being particularly useful and had been plagued by slips. The line was accordingly terminated in Okaihau, which was on the main State Highway north (SH1). During 1938 and
World War II the abandoned trackage was salvaged, sometimes by
bullock teams, for use elsewhere, especially the
Dargaville Branch. ==Stations==