Taupo Totara Timber Company Railway
Railway line of the Taupo Totara Timber Company showing "the corkscrew", with five different levels[1]
Technical
Track gauge	3 ft 6 in (1067 mm)
Route map Legend km from Hamilton (NZR) to Rotorua (NZR) 0,0 former transfer to the NZR network Taupo Totara Timber Co. in Putāruru Tokoroa 29,0 Kinleith Mill Waikato River The Spiral or The Corkscrew 82,0 Taupo Totara Timber Co. in Mokai Wooden tracks into the bush Fan like network in the bush

The Taupo Totara Timber Company Railway ("TTT Railway") was constructed by the Taupo Totara Timber Company (TTT) to link their milling centre at Mokai with the New Zealand Government Railways line (NZR) at Putāruru in the Waikato region on the North Island of New Zealand. The more than 51 miles (82 km) long light railway line was operated from 1903 to 1944 by the Taupo Totara Timber Company. After the closure of the Mokai mill, the NZR purchased the 19 miles (31 km) stretch between Putāruru and the Kinleith Mill south of Tokoroa.^[2] This stretch of track underwent a major reconstruction, and is now⁽²⁰²⁴⁾ part of KiwiRail's Kinleith Branch Line.

The 82 kilometres (51 mi) line was built for the TTT between 1903 and 1905 by John McLean & Sons^[3] to carry sawn timber from the TTT sawmill at Mokai (23 kilometres (14 mi) northwest of Taupō) to the government railway at Putāruru. It was designed as a contour^[4] railway by former Wellington and Manawatu Railway engineer and TTT director James Fulton,^[4][5] who in 1903 temporarily resigned his position on the TTT board to supervise construction of the railway and sawmills.

The 8 kilometres (5.0 mi) northern section between Putāruru and Lichfield was built on the formation of the former Lichfield Branch line, which was originally built by the New Zealand Thames Valley Land Company (NZTVLC) to be part of the line to Rotorua. The permanent way (rails and sleepers) had been removed in 1897 after the failure of the NZTVLC's Lichfield town development (known as the "Selwyn Estate"),^[6] leaving only the earthworks.^[5]

The TTT line continued south of Lichfield over easy country through what is now Tokoroa to Kopakorahi, near the present-day⁽²⁰²⁴⁾ Tokoroa Golf Course and Kinleith paper mill. From Kopakorahi it crossed the Maungaiti Range via the Wawa saddle, descending 1,000 feet (300 m) from Wawa to Ongaroto, where it crossed the Waikato River. The line continued south and uphill to the sawmill village at Mokai.^[7]

Several bush tramways, some temporary, brought logs from the forests to the Mokai sawmill.^[8]

The Putāruru to Mokai line had a ruling grade of 1 in 35.^[4][9] The construction contract specified 100 feet (30 m) radius curves on steep sections and curves of 3 chains (60 m) to 5 chains (100 m) on easier sections.^[9] Some of the sharper curves were later rebuilt with wider radii.

Initially the TTT Railway operated as a private carrier, carrying TTT staff and their families, guests,^{[10][8][11][12]} freight, and mail^[13][14] between Putāruru and Mokai.

From January 29, 1908, the TTT Railway opened its freight and passenger^[15] services to the public under the terms of a NZ Government Order in Council.^[16] The line provided a direct connection between Putāruru and the settlements of Lichfield, Tokoroa, Ongaroto, and Mokai.^[17] Passengers and freight for destinations such as Wairakei, Taupō, Tokaanu, and northern Hawkes Bay, would be set down or picked up at a siding approximately 3 miles (4.8 km) from Mokai.^[18] A Government road facilitated transportation between the siding, Oruanui, Wairakei,^[19] and Taupō.

A siding at Kopakorahi was used for changing locomotives. Heisler geared locomotives hauled trains over the mountainous section between Kopakorahi and Mokai. From 1914, trains on the easier northern section between Putāruru and Kopakorahi were usually hauled by locomotive number 7, an articulated Mallet Compound locomotive.

A typical TTT train consisted of one locomotive (or occasionally two), multiple flat cars, and a van with passenger accommodation. The TTT used hand-operated train-brakes, controlled by a brake operator who walked along the tops of the cars, manually adjusting the brakes on each vehicle.

The TTT Railway crossed the Waikato River at Ongaroto, approximately 5.6 km southwest of the present-day⁽²⁰²⁴⁾ State Highway 1 bridge near Ātiamuri .

The first Ongaroto rail bridge was built in 1904. Designed by James Fulton, this timber bridge had a single span of 231 feet (70 m) and a total length of 260 feet (79 m). The structure consisted of four bolted laminated timber arches (two each side), stiffened by a timber through-truss. Except for hardware such as bolts, the bridge was built entirely of locally-sourced totara.^[20]

To provide support and access during construction, the contractors in late 1903 erected a temporary suspension bridge. Prior to construction of the arch bridge, the suspension bridge provided access for Mokai traffic.^[20][21][22] The suspension bridge cables are visible in early photos of the timber arch bridge.

In the late 1920s the timber arch bridge deteriorated and consulting engineer Stanley Jones recommended replacement. Following Jones's inspection and report, the company banned anyone from riding the train across the bridge. Trains would stop at the bridge and the passengers and fireman would walk across. The driver would gently open the throttle and then jump off. The train would slowly ease across the bridge before being stopped on the other side by the fireman, where everyone would reboard the train.^[23]

In 1931 a new steel truss bridge was built a short distance downstream of the timber arch bridge. Designed by Edgar Jones, of Jones and Adams consulting engineers, the bridge was erected by Wilcox and Company Ltd, at a cost of £10,000. ^[24][25][23]

The steel bridge was designed with two spans, supported by a central pier. The contractors sank a coffer dam and started building foundations for the central pier. However, a hot water eruption flooded the coffer dam, causing it to float off. It was decided to relocate the mid-river pier. Some of the steel-work had already been fabricated, so one of the spans was redesigned as a cantilever supporting the end of the other girder. This bridge stood successfully until it was removed some years after the closure of the TTT railway.^[20][26]

The timber arch bridge was dismantled in 1933 and the timber sold.^[27][23]

The steel truss bridge's deck was expected to be submerged a "few feet" below the surface of Lake Whakamaru, when the Whakamaru dam was flooded.^[28] The bridge was removed before the dam was flooded.^[29]

A concrete bridge was later erected at the site of the Ongaroto rail bridges.

In 1911 the TTT put forward a proposal to extend their line from Mokai to Taupō via Oruanui and Wairakei.^[30][9][31] Residents in the Taupo district formed the Taupo District Railway League to support the project.^[32] However, the proposal triggered controversy.^[33][31]

The NZ Government in 1913 issued an Order in Council authorising the extension, and in 1914 passed legislation describing the process to be followed.^[34][35] The company was unable to implement the project, and eventually abandoned the Taupo Extension proposal.

The TTT railway closed on 26 October 1944. The 19 miles (31 km) section from Putāruru to the "19-Mile Peg", near the present-day location of the Kinleith Paper Mill south of Tokoroa, was purchased by the NZR^[2] in September 1946.

This section reopened on 9 June 1947 under the control of the Public Works Department using steam locomotives purchased from the TTT.^[36]

Around the same time plans were being made for a large pulp and paper mill to be constructed at Kinleith. Beginning in January 1949,^[37] the line underwent a major reconstruction, reducing grades from 1 in 44 to 1 in 70 and easing curves from 201-metre radius to 322 metre radius. The rebuilt line was handed over to NZR on 12 June 1950.^[38] This section is still⁽²⁰²⁴⁾ being used for goods transport as part of the NZR's Kinleith Branch Line.

• 2 combination car for passengers and freight^[40]
• 1 freight van^[40]
• 20 ACF flat cars purchased in 1904^[41]
• 10 ACF flat cars purchased in 1907^[42]
• 10 flat cars (on order, 1921)^[40]

• 
  Heisler steam locomotive No 8^[1]
• 
  Heisler steam locomotive No 9^[1]
• 
  Empty train ton the return trip to Mokai^[1]
• 
  Loco No 7 at Ngutuwera T.T.T. Railway, 1947^[1]
• 
  Map of the Taupo Totara Timber Company Railway and surrounding district, 1903 - 1905.

• Taupo railway proposals

• Alexander Turnbull Library TTT Co Gallery
• Folksong: The T.T. Line
• TTT locomotive #5 history
• TTT locomotive #7 specifications and history