Manunui station was on the North Island Main Trunk line, in the Ruapehu District of New Zealand, serving Manunui. It was 2.9 km (1.8 mi) south east of Matapuna and 4.63 km (2.88 mi) north of Piriaka. Freight was handled from 2 September 1904, though it wasn't until 16 September 1908 that it was listed as having a station yard, formation and fencing and 10 November 1908, when it was described as a 6th class station, with passenger platform, urinals, cart approach, a 30 ft (9.1 m) x 20 ft (6.1 m) goods shed and loading bank. On 24 July 1913 a request for lighting was added. A passing loop originally provided for trains of up to 26 wagons, but was extended to 100 in 1970 and 123 in 1980. By then Caltex had a siding for 11 wagons and a fertiliser store for 15.