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The South African Railways Class MJ1 2-6-6-0 of 1918 was a class of articulated steam locomotives.
In 1918, the South African Railways placed eight Class MJ1 Mallet articulated compound steam locomotives with a 2-6-6-0 wheel arrangement in branch line service. [1] [2] [3] [4]
Because of the difficulties experienced by the usual British and German suppliers to build new locomotives during the First World War, orders for the Class MJ1 2-6-6-0 Mallet articulated compound steam locomotive were placed with Montreal Locomotive Works (MLW) in Canada. The locomotive was designed by MLW, based on the specifications for the Class MJ Mallet which had been designed by D.A. Hendrie, the Chief Mechanical Engineer (CME) of the South African Railways (SAR) from 1910 to 1922. Eight of these branch line locomotives were built and delivered by MLW in November 1918, numbered in the range from 1666 to 1673. [1] [2] [4]
The locomotives were superheated, had Walschaerts valve gear and, like the Class MJ Mallets, had Belpaire fireboxes, but slightly larger boilers. When compared to the Class MJ, a distinguishing feature of the Class MJ1 was the sandbox which was mounted on top of the boiler to the rear of the steam dome in North American style. In general appearance, they bore a family resemblance to the Class 14C and Class 15B 4-8-2 locomotives which were also built by MLW in 1918. [1] [2] [4]
During 1922, the coupled wheels were retyred and their diameter was increased from 42+1⁄2 inches (1,080 millimetres) to 42+3⁄4 inches (1,086 millimetres). [2]
During 1939, while W.A.J. Day was the CME of the SAR, the Classes MJ and MJ1 were modified slightly to be reboilered with the same standard boiler. [2]
The Class MJ1 was the last Mallet locomotive class to be placed in service by the SAR. All the Railway’s subsequent new articulated locomotives were to be Garratts, Modified Fairlies and Union Garratts. [5]
The Class MJ1 was also intended for branch line working and joined the Class MJ Mallets in service in the Eastern Cape. All eight were still in service by March 1948, but they were all withdrawn from service by 1960. [1] [4] [5]
Under the Whyte notation for the classification of steam locomotives by wheel arrangement, a 2-6-6-2 is a locomotive with one pair of unpowered leading wheels, followed by two sets of three pairs of powered driving wheels and one pair of trailing wheels. The wheel arrangement was principally used on Mallet-type articulated locomotives, although some tank locomotive examples were also built. A Garratt type locomotive with the same wheel arrangement is designated 2-6-0+0-6-2.
Under the Whyte notation for the classification of steam locomotives by wheel arrangement, 2-6-6-0 is a locomotive with one pair of unpowered leading wheels, followed by two sets of three pairs of powered driving wheels and no trailing wheels. The wheel arrangement was principally used on Mallet-type articulated locomotives. Some tank locomotive examples were also built, for which various suffixes to indicate the type of tank would be added to the wheel arrangement, for example 2-6-6-0T for an engine with side-tanks.
Under the Whyte notation for the classification of steam locomotives, 2-6-0+0-6-2 represents the wheel arrangement of an articulated locomotive with two separate swivelling engine units, arranged back to back with the boiler and cab suspended between them. Each engine unit has two leading wheels in a leading truck, six powered and coupled driving wheels on three axles and no trailing wheels.
Under the Whyte notation for the classification of steam locomotives by wheel arrangement, a 4-8-2+2-8-4 is a Garratt articulated locomotive consisting of a pair of 4-8-2 engine units back to back, with the boiler and cab suspended between them. The 4-8-2 wheel arrangement has four leading wheels on two axles, usually in a leading bogie, eight powered and coupled driving wheels on four axles and two trailing wheels on one axle, usually in a trailing truck. Since the 4-8-2 type is generally known as a Mountain, the corresponding Garratt type is usually known as a Double Mountain.
The South African Railways Class 15B 4-8-2 of 1918 was a steam locomotive.
The Union of South Africa was established on 31 May 1910 in terms of the South Africa Act, which unified the former Cape Colony, Natal Colony and the two colonised former republics, the Transvaal and the Orange Free State. One of the clauses in the Act required that the three Colonial Government railways, the Cape Government Railways, the Natal Government Railways and the Central South African Railways, also be united under one single administration to control and administer the railways, ports and harbours of the Union. While the South African Railways (SAR) came into existence in 1910, the actual classification and renumbering of all the rolling stock of the three constituent railways required careful planning and was only implemented with effect from 1 January 1912.
The South African Railways Class NG G11 2-6-0+0-6-2 of 1919 was a narrow gauge steam locomotive.
The South African Railways Class MA 2-6-6-0 of 1909 was a steam locomotive from the pre-Union era in the Natal Colony.
The South African Railways Class ME 2-6-6-2 of 1912 was a steam locomotive.
The South African Railways Class MH 2-6-6-2 of 1915 was an articulated Mallet-design steam locomotive.
The South African Railways Class MJ 2-6-6-0 of 1914 was a class of articulated steam locomotives.
The South African Railways Class FC 2-6-2+2-6-2 of 1925 was an articulated steam locomotive.
The South African Railways Class GH 4-6-2+2-6-4 of 1928 was an articulated steam locomotive.
The South African Railways Class GA 2-6-0+0-6-2 of 1921 was an articulated steam locomotive.
The South African Railways Class GB 2-6-2+2-6-2 of 1921 was an articulated steam locomotive.
The South African Railways Class GC 2-6-2+2-6-2 of 1924 was an articulated steam locomotive.
The South African Railways Class GEA 4-8-2+2-8-4 of 1946 was an articulated steam locomotive.
The South African Railways Class GO 4-8-2+2-8-4 of 1954 was an articulated steam locomotive.
The South African Railways Class 14C 4-8-2 of 1918 was a steam locomotive.
The South African Railways Class 14C 4-8-2 of 1919 was a steam locomotive.