| Weight | Locomotive – 68t |
| Driving Wheels | 3ft 9ins |
| Boiler Pressure | 175psi |
| Cylinders | Outside – 19in x 27in |
| Tractive Effort | 28,430lbf |
| Valve Gear | Allan |
The South African Railways class H2 4-8-2T of 1909 was a steam locomotive from the pre-Union era in the Colony of Natal.
In 1877, the Natal Government Railways (NGR) acquired the Natal Railway Company for the sum of £40,000, gaining the line from the Point to Durban and from Durban to Umgeni. The core line went from Durban to Volksrust, but reached Charlestown (2.5 miles from the border of the South African Republic) in 1891 and was linked to the Witwatersrand in 1895. Other important lines were the one linking with the Orange Free State reaching Harrismith in 1892, as well as the North Coast and South Coast lines.
When the Union of South Africa was established on 31 May 1910, the three Colonial government railways (Cape Government Railways, NGR and Central South African Railways) were united under a single administration to control and administer the railways, ports and harbours of the Union. Although the South African Railways and Harbours came into existence in 1910, the actual classification and renumbering of all the rolling stock of the three constituent railways were only implemented with effect from 1 January 1912.
The requirement for a tank locomotive which could haul at least one-and-a-half times as much as a Dübs 4-8-2T locomotive on the mainline of the Natal Government Railways (NGR) resulted in the design of a 4-10-2 tank locomotive by NGR Locomotive Superintendent G.W. Reid. Altogether 101 of these locomotives were built by Dübs and Company and North British Locomotive Company. They were delivered between 1899 and 1903.
On the NGR, the locomotive type became known as the Reid Tenwheeler, until a classification system was introduced in 1905 or 1906 and they were designated the NGR class C.
When the Reid Tenwheelers began to be withdrawn from mainline service and placed on branch line and shunting service where smaller radius curves were encountered, it was found that the ten-coupled wheelbase was prone to derailment in many goods yards. By the end of 1908, these locomotives were all still shown on the NGR roster as 4-10-2T locomotives, but from around 1909 some of them were gradually converted to a 4-8-2T wheel arrangement by removing the fifth set of coupled wheels and blanking off the resulting opening in the frame.
By 1910, five of the locomotives had been converted to a 4-8-2T wheel arrangement and in 1912, when the South African Railways classification and renumbering of locomotives took place, these five were designated class H2. These were NGR numbers 170, 173, 175, 217 and 240, all built by Dübs between 1901 and 1903. They were renumbered in the range 227-231 on the South African Railways (SAR).
Of the remaining 96 unmodified 4-10-2T Reid Tenwheelers, three had already been scrapped by 1912. The rest were designated class H and were renumbered in the range from 232 to 324 by the SAR.
After 1912, these class H locomotives were gradually also modified to a 4-8-2T wheel arrangement. The first three to be modified after being rostered in SAR service, numbers 240, 294 and 305, were reclassified to Class H2 as well and were renumbered once again, to 329, 330 and 331 respectively. The rest retained their class H numbers after modification and reclassification.
The class H2 locomotives were employed extensively on shunting duties in many parts of the country. By 1964, however, the only large tank engines still active on the SAR were fourteen of the class H2s locomotives and one class H1. The class H2s were all allocated to Greyville Locomotive Depot in Natal, where they were used on station pilot duties at Durban and to shunt around the Harbour.
Because of their light axle loading, the last ones to remain in service were retained for use on the Bluff in Durban until 1977, more than three-quarters of a century after they entered service. The main reason for their longevity was that, until the arrival of class 36-000 diesel-electric shunting engines earlier in 1975, the H2’s were the only locomotives able to pass beneath the staithes of the aged Bluff coaling appliance at Wests and up to four or five of them were rostered for this work at any time. Two of the class H2s, numbers 329 and 330, were retained in service at Greyville Locomotive Depot, mainly to shunt the coal stage, until its eventual closure in September 1976.
Preservation
Three class H2 locomotives have been preserved.
Dübs and Company Works No 4056 – NGR 166 & SAR 249
Dübs and Company Works No 4273 – NGR 219, SAR 330
Dübs and Company Works No 4324 – NGR 239 & SAR 314
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