Римутака: История Железнодорожного Уклона в Новой Зеландии

The Rimutaka Incline was a 3 mile (5 km), 3 feet 6 inches gauge railway line on an average grade of 1 in 15 using the Fell system between Summit and Cross Creek stations on the Wairarapa side of the original Wairarapa Line in the Wairarapa district of New Zealand. The term "Rimutaka Incline" is sometimes used incorrectly to refer to other parts or all of the closed and deviated section of the Wairarapa Line between Upper Hutt and Speedy's Crossing, near Featherston. The incline formation is now part of the Remutaka Rail Trail.

The construction of a railway from Wellington to Masterton was authorised in the Railways Act passed on 13 September 1871. Julius Vogel, Colonial Treasurer, travelled to England to raise finance for a major public works programme for railway construction. Vogel returned via the United States, where he studied rail systems. After the act of parliament was passed, a survey party set out to make preliminary investigations of possible routes for a railway over the Rimutaka Range (now spelled "Remutaka Range"). These were complete by December 1870, the party having investigated four routes. A commonality between all the proposals was the section from Upper Hutt to Kaitoki (later Kaitoke). Between Kaitoke and the Wairarapa, the four proposals were the Tauwharenikau Route, Mr Sinclair's Route, a coastal route and the Pakuratahi Route. While the government was conducting its surveys, Wellington Province Superintendent William Fitzherbert instructed his Provincial Engineer, Charles O’Neill, to investigate the possibility of a railway through the Rimutaka Valley (the route of the road between Featherston and Upper Hutt), with a tunnel through the dividing range. The survey was carried out between May and 21 July 1871, and O’Neill reported that a tunnel 130 chains (2.6 km) long would be required, with the line rising at 1 in 60 from the Pakuratahi to the tunnel then descending at 1 in 40 to Featherston. This survey was forwarded to the Minister for Public Works. In mid 1873 the route to Featherston was chosen after a final survey for the route from Upper Hutt to Summit. For the line between Summit and the Wairarapa, several proposals were considered. The first, with gradients up to 1 in 30, was dismissed. It was found that to keep the gradient to no steeper than 1 in 40, curves of three chains (60 m) radius would be required. This would have required special rolling stock and heavy earthworks and was thus abandoned. Another proposal was known as the Birch Spur Incline. This would have involved the line continuing from Summit to Birch Spur from where a rope worked incline would convey traffic to the valley floor where the railway would continue through a narrow valley to the Wairarapa plains. The Public Works Department engineers investigating this proposal were unable to locate a suitable incline, so this proposal was also abandoned. The last option was a three mile (4.8 km) incline with gradients averaging 1 in 15 "to be worked by locomotives of an unusual nature". This line was the most favourable from an engineer's point of view, and required not unreasonable earthworks. The final decision was made by the head of the Public Works Department, John Carruthers. He determined that an incline worked by the Fell system would be suitable, and cited the Mont Cenis Pass Railway as an example. Though special locomotives would be required, factors in its favour were that ordinary rolling stock could be used and it was a proven system. It was to be the third and last Fell system employing the centre rail for both tractive power and braking, and the longest surviving. Though it was considered to be a "temporary" measure, it outlasted the second such system in Brazil by 72 years.

Construction of the Rimutaka Incline was included in two contracts that were let for the building of the original Wairarapa Line. These contracts were known as the Summit contract and the Incline contract.

This contract included the excavation of Summit station yard and related drainage, Summit tunnel, and formation work to a point 26 chains (523 m) beyond the tunnel. It was the shortest contract of those let for the line, it was finished by the original contractor, and it had the fewest alterations. Work was to start on 12 July 1874 and to be completed by 22 July 1876, at which time the Pakuratahi contract was due to be completed. Summit yard was a large cut into the hillside, 120 feet (37 m) wide and long initially. Excavations removed material to a depth of 15–20 feet, with this fill being dumped on the opposite side of the yard to form level ground. On the hillside above the yard, further ground was levelled and houses erected thereon. After the yard had taken shape, the next job was the tunnel. The approach to the tunnel was about 6 chains long and up to 60 feet (18 m) deep. The line entered the tunnel on a downward grade of 1 in 1,000, steepening to a grade of 1 in 15 at the eastern portal. At that end a small drainage tunnel had to be built to divert a stream that had flowed down a steep gully where the tunnel mouth was to be. The maximum height of the tunnel was 15 feet (5 m) above the floor: once rails were laid the maximum clearance was 13 feet (4 m) The width of the tunnel varied from 10 feet (3 m) at the floor to 12 feet (4 m) at 7 feet (2 m) above the floor. Despite castigation from various parties, it was not until March 1877 that work on both ends of the tunnel met at the middle, having taken three and a half years to complete. The Public Works Department lined the tunnel after the rails had reached the site, enabling them to use work trains to bring materials and other supplies in. It was during this phase that the only fatality on this contract occurred: on 3 May 1878, a sizeable portion of the lining collapsed on two men. One was killed outright, the other lost his eyesight due to severe head injuries. The Summit contract was completed on 10 December 1877, 17 months behind schedule.

On 5 October 1875, the Incline contract was awarded to Charles McKirdy for the sum of £49,029. The contract covered the formation only, with the Public Works Department responsible for track laying. The contract began outside Summit tunnel and terminated at Featherston, a distance of 8 miles 76 chains (14.403 km). It included Cross Creek station yard and runaway siding. Several alterations were made to the contract both prior to and during construction, including the replacement of one of three tunnels by a cutting, and three wooden bridges by embankments. The line descended at a grade of 1 in 15, passing through the 396 feet (121 m) long Horseshoe Gully Tunnel (later Siberia Tunnel). On leaving the tunnel, the line crossed the gully on a high earth and rock embankment, the largest on the section, on a five chain radius curve. The embankment was about 180 to 200 feet (61 m) wide at its base, and around 90 feet (27 m) high at its centre line. After the embankment, the line continued at a grade of 1 in 15 down to Cross's Creek (later Cross Creek) station. From Cross Creek the line descended at gradients varying from level to 1 in 40 to Lucena's (later Pigeon Bush), and from there in a straight line to Featherston. Work on the contract began on 22 October 1875. None of the major earthworks seem to have presented any great difficulties, save the lower tunnel, which was plagued by accidents and materials failures largely because of the unstable nature of the rock through which it passed. The tunnel was named Price's after the manager McKirdy employed for this contract. On 2 March 1876, two men died due to a cave in of the tunnel roof. Between October 1877 and March 1878, platelaying was completed up to Summit. This enabled the use of work trains to haul up materials that were used to line Summit Tunnel. Track laying on the incline commenced in April 1878 and reached Cross Creek the following month. During this work, H 199 was stabled at Summit and used to haul work and ballast trains to the railhead. Initially, only simple arrangements were made for the station yard at Cross's Creek, as it had yet to be decided the nature of operations on the Incline. It consisted of the main line, an engine siding of 10 chains, and the runaway siding. After formation work continued beyond Cross Creek, McKirdy ran out of time and money, with the remainder of his contract being picked up by his guarantors, T. W. Young and Robert Greenfield. They finished the formation to Featherston on 17 August 1878, with track laying finishing the following month. The contract was completed 13 months late.

In 1936 seven lightweight Wairarapa railcars, RM 4–10, were introduced between Palmerston North, Masterton and Wellington. They were specifically designed for the Incline, and were built at the Hutt Workshops. They were named after historic Maori canoes: Maahunui, Mahuhu, Mamari, Matahourua, Mataatua, Arai te Uru and Arawa. Initially powered by Leyland petrol engines, they were upgraded after several years to diesel engines. They had a single rear driving axle with 38½" (978 mm) diameter wheels, necessitated by the need for the axle and final drive unit to have sufficient clearance above the Incline’s centre rail. Because of the large rear wheels the floor of the passenger compartment was 52½" (1334 mm) above rail level, more than higher than normal. They were rated for a maximum speed of and expected to climb the Incline at 15 17 mph, but actually managed only 10–12 mph. Nevertheless, they greatly speeded up passenger trains on the route and immediately proved popular. They were withdrawn in 1955 when the Incline closed.

Several options for an alternative to the Incline were considered in the 20th century, but it was not until after WWII that a route through a tunnel between Maymorn and Lucena's Creek was selected. Construction was started in 1948 by the Public Works Department and completed by a private contractor in 1955. The tunnel and deviation opened on 3 November 1955, five days after the Incline closed. Demolition was swift, with the removal of track between Cross Creek and Pigeon Bush largely completed by March 1956. H 199 was used to haul the work trains that removed the track between Cross Creek and Summit. The buildings were sold at auction, on site. Some of the rails were sent to the Rewanui Incline, as were a couple of the Fell brake vans. Five of the six H class locomotives were towed to the Hutt Workshops, later to Silverstream, to be scrapped.

A museum dedicated to the preservation of the only remaining H class "Fell" locomotive was opened at Featherston in 1984. H 199 had previously been given to the town of Featherston, and had been a static display in a local park from 1958. Later, a lease was secured on F 210, the sole remaining Fell brake van, which is now also on display in the museum.

A resurgence of public interest in the incline followed the publication of a book in 1976 and the opening of the Fell Engine Museum in the early 1980s, prompting the New Zealand Forest Service to re establish access to Cross Creek in 1984. The official opening of a rail trail using the formation of the original railway line from Cross Creek to Kaitoke followed in 1987. It is today one of the more popular recreational facilities in the region and forms part of the Remutaka Forest Park.

Inspired by H 199, Joy Cowley authored Hero of the hill in 2013. The book traces the train's journey up the incline during a particularly stormy night.

In October 2005 a reunion of former NZR staff and friends who worked the Incline was held in Featherston, including a visit on 29 October to Cross Creek to commemorate 50 years since the last train ran on the Incline. On the same day a ″first spike″ ceremony was held at Maymorn to mark the beginning of the Rimutaka Incline Railway Heritage Trust's project to reinstate the railway. On 8 August 2003 the trust was inaugurated with the intention of reinstating the line in four stages: Upper Hutt to Summit; Wellington to Upper Hutt (using KiwiRail's Wairarapa Line); Summit to Cross Creek; Cross Creek to Featherston. The base of operations is on land leased from KiwiRail at Maymorn. Largely thanks to the establishment of the Remutaka Rail Trail, most of the original formation has been preserved and is proposed to be incorporated into the reinstated rail operation, with new works required at Maymorn to link the original formation to the station yard and a deviation at Kaitoke to bypass formation land that is now in private ownership. The original route from Upper Hutt to the Mangaroa valley is not included in the trust's plans. Work on the project is currently at stage one, with the acquisition of rolling stock for restoration, fencing, track laying in the yard, and the construction of a rail vehicle shed.