- South Island Main Trunk Railway
The Main North Line between Picton and Christchurch and the
Main South Linebetween Lyttelton and Invercargill, running down the east coast of the South Islandof New Zealand, are sometimes together referred to as the South Island Main Trunk Railway (SIMT). Construction of a main line running the length of the east coast began in the 1860s, but trains could not operate all the way from Picton to Invercargill until 1945.
Main South Line
Construction of the Main South Line began in 1865 when the
Canterbury Provincial Railwaysbegan work on a 1,600mm (5'3") broad gaugeline south from Christchurch. It reached Rolleston on 13 October 1866and Selwyn a year later. A number of routes south were considered, and the one chosen was a compromise between a proposal to build a coastal line through fertile territory and a proposal to build an inland line to achieve easier crossings of rivers such as the Rakaia. However, construction had to be postponed as the Canterbury Provincegovernment was low on funds, and it did not restart until Julius Vogelannounced the central government's "Great Public Works Policy".
The "Great Public Works Policy" placed a high priority on the completion of the Main South Line. At this time, New Zealand accepted RailGauge|42 narrow gauge as its national
rail gauge, but Canterbury was permitted to extent its broad gauge as far as Rakaia- although it did so on 2 June 1873, it converted its entire network to narrow gauge by 6 March 1876. Further south, the Dunedinand Port ChalmersRailway was opened on 1 January 1873as the first railway in the country to adhere to the new national gauge. Although the final portion of this line became the Port Chalmers Branch, most of it was incorporated into the main line northwards and construction progressed through difficult terrain towards Oamaru. South of Dunedin, work was progressing on a link with Invercargill; a line between Invercargill and Gore was opened on 30 August 1875and a line between Dunedin and Balclutha was opened two days later. Construction to link these sections faced more construction challenges than the earlier work had, and accordingly, the rate of progress slowed.
Over the next three years, the line between Dunedin and Christchurch was completed; Christchurch and
Timaruwere linked on 4 February 1876, followed by Oamaruon a year later, and the difficult section between Oamaru and Dunedin was finally completed on 7 September 1878. All that remained was the Balclutha-Gore link, which was opened on 22 January 1879, completing the Main South Line.
Main North Line
Construction of the Main North Line was one of the longest construction projects in New Zealand's history. Through the 1870s, work on a line from Christchurch to northern centres in Canterbury was undertaken, with a line through
Kaiapoi, Rangiora, and Amberley reaching Waiparain 1880, and at the other end, a line linking Blenheim and Picton opened in 1875. From this point, however, construction became delayed by disputes over proposed routes. Regional actors sought to protect their interests, and some sought a coastal route via Parnassus and Kaikoura, others favoured an inland route to Blenheim with a branch from Tophouseto Nelson, and there was even a proposal to use this route as the trans-Alpine line (as the Midland Line's route was yet to be chosen), linking Waipara with Reefton and then connecting to Nelson and possibly Blenheim via a line up the Buller Gorge.
The people of Marlborough favoured a coastal route and began work south, while in Canterbury, work initially began on an inland route, with Waipara linked to
Culverdenin 1886. Although the line to Culverden was treated as the main line for decades, it eventually became part of the Waiau Branch. At the start of the 20th century, work began on a coastal route northwards from Waipara, with the line opened to Parnassus in 1912. Construction then proceeded up the Leader Rivervalley as part of a somewhat inland route to Kaikoura via river valleys, but the start of World War Ibrought a halt to construction and the 3km of track laid beyond Parnassus was removed. The war also brought a halt to work at the northern end, with the coastal village of Wharanuiestablished as the terminus of the line south from Blenheim.
The 1920s saw much indecisiveness and disputes over what route to take between Waipara and Wharanui. The Culverden line now ran all the way as
Waiauand some work took place on a line to link Waiau with Kaikoura, but after a few kilometres of formation was made, work came to a halt. The coastal route was then chosen and work had only just restarted when the Great Depressionbegan and brought about more severe delays. Fortunes improved in 1936 sufficiently to allow a resumption of progress, and a more coastal route out of Parnassus than the Leader Valley route was chosen. World War IIbrought even more delays, but this time, construction progressed through wartime and the Main North Line was finally completed when the northern and southern ends met in Kaikoura on 15 December 1945.
The South Island Main Trunk has been famous for its passenger services. In the days of
steam locomotives, the South Island Limitedexpresses were particularly famous; drivers of J and JA class locomotives claimed to have broken the official New Zealand railway speed record on a section of track near Rakaia called the "racetrack". The Main South Line saw the last regularly steam-hauled expresses in New Zealand, with JA locomotives hauling the Friday and Sunday night expresses until 26 October 1971. All other steam-hauled expresses were replaced on 1 December 1970by the Southerner, which was hauled by DJ class diesel-electric locomotives. This service was one of the most famous in New Zealand, but it ceased on 10 February 2002.
For many years, RM (Fiat)
railcars ran services on the Main North Line, but they were withdrawn during the 1970s. On 25 September 1988, a tourist-focused express known as the Coastal Pacific began operating along the scenic route between Christchurch and Picton; it continues to operate today and is now known as the TranzCoastal. In the summer of 1994-95, this service was augmented by the Lynx Express, but it was unsuccessful and not repeated in later years. Commuter services used to operate around major centres along the South Island Main Trunk, and many rural services also operated when country branch lines were operational, but the branch lines progressively closed during the 20th century and commuter services in the South Island ceased in the 1980s. Nowadays, the only passenger services on the South Island Main Trunk are the TranzCoastal and the TranzAlpine, which uses the short portion of the Main South Line between Christchurch and Rolleston before running down the Midland Line to Greymouth.
Freight services on both lines operated for many years as feeder services from rural districts to nearby major centres and harbours, rather than utilising long-distance services between the important cities. The first through freight from Christchurch to Invercargill did not operate until December 1970. During the 1970s and 1980s, patterns of freight haulage changed dramatically, with the last of the branch lines closing and an emphasis placed upon long-distance haulage. The South Island Main Trunk is now used to carry significant quantities of long-distance freight, and it connects with the network in the
North Islandvia roll-on roll-off ferries in Picton. These ferries have allowed freight trains to be operated from Aucklandto Christchurch on a 30 hour schedule.
* Churchman, Geoffrey B., and Hurst, Tony; "The Railways of New Zealand: A Journey Through History", HarperCollins Publishers (New Zealand), 1991 reprint
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