The South African Railways Class MJ 2-6-6-0 of 1914 was a class of articulated steam locomotives. Between 1914 and 1921, the South African Railways placed eighteen Class MJ Mallet articulated compound steam locomotives with a wheel arrangement in branch line service.Espitalier, T.J.; Day, W.A.J. (1945). ''The Locomotive in South Africa - A Brief History of Railway Development. Chapter VII - South African Railways (Continued).'' South African Railways and Harbours Magazine, May 1945. pp. 349-350.South African Railways and Harbours Locomotive Diagram Book, 2’0” & 3’6” Gauge Steam Locomotives, 15 August 1941, as amended

Manufacturers

The Class MJ 2-6-6-0 Mallet articulated compound steam locomotive was designed by D.A. Hendrie, Chief Mechanical Engineer (CME) of the South African Railways (SAR) from 1910 to 1922, to meet the need for engines with a higher tractive effort to cope with heavy traffic on branch lines.

Ten of these branch line locomotives were ordered from Maffei of

Munich Munich ( ; german: München ; bar, Minga ) is the capital and most populous city of the States of Germany, German state of Bavaria. With a population of 1,558,395 inhabitants as of 31 July 2020, it is the List of cities in Germany by popu ...

but, as a result of the outbreak of the

First World War World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fightin ...

, only two could be delivered from Germany in 1914, numbered 1651 and 1652. The order for the remaining eight was then transferred to the

North British Locomotive Company The North British Locomotive Company (NBL, NB Loco or North British) was created in 1903 through the merger of three Glasgow locomotive manufacturing companies; Sharp, Stewart and Company (Atlas Works), Neilson, Reid and Company (Hyde Park Wor ...

(NBL) in Scotland, who delivered them in 1917 and 1918, numbered in the range from 1653 to 1660. The entry for the Mallets in the NBL works register shows them as ordered on 20 April 1915 and delivered from February to March 2016. Those dates are probably ex works dates rather than actual delivery dates.North British Locomotive Company works list, compiled by Austrian locomotive historian Bernhard SchmeiserNorth British Locomotive Co. (from J. Lambert) After cessation of hostilities in 1918, Maffei approached the SAR and requested that the balance of the original order, which had been built in 1914 but could not be delivered because of the war, also be accepted. These eight locomotives were delivered in 1921, numbered in the range from 1674 to 1681.

Characteristics

The locomotives had

Walschaerts valve gear The Walschaerts valve gear is a type of valve gear used to regulate the flow of steam to the pistons in steam locomotives, invented by Belgium, Belgian railway mechanical engineering, engineer Egide Walschaerts in 1844. The gear is sometimes name ...

and were superheated, using the Schmidt type superheater. Unlike most of the other SAR Mallet classes, which had round-topped fireboxes, the Class MJ had

Belpaire firebox The Belpaire firebox is a type of firebox used on steam locomotives. It was invented by Alfred Belpaire of Belgium in 1864. Today it generally refers to the shape of the outer shell of the firebox which is approximately flat at the top and squa ...

es. The four cylinders were arranged outside the thick bar frames. The locomotives were delivered with Type MP1 tenders with a coal capacity of and a water capacity of . The same tender was used by altogether fifteen other SAR locomotive Classes.

Reboilering

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, once again with Belpaire fireboxes.

Service

With its light axle loading, the Class MJ was intended for branch line working. Most of them were placed in service in the Eastern Cape, but four went to Natal and are believed to have worked on the Eshowe branch line. They gave satisfactory service on the Cape Eastern System where the moderate speeds required on the sections over which they worked enabled them to give reasonably good results. Two of the locomotives, NBL-built no. 1655 and Maffei-built no. 1674, had the distinction of being the last two Mallet engines to remain in SAR service. They were scrapped in the East London workshops in 1962, after having worked on the branch line between Amabele and

Umtata Mthatha , formerly Umtata, is the main city of the King Sabata Dalindyebo Local Municipality in Eastern Cape province of South Africa and the capital of OR Tambo District Municipality. The city has an airport, previously known as the K. D. Matanzi ...

Transkei Transkei (, meaning ''the area beyond he riverKei''), officially the Republic of Transkei ( xh, iRiphabliki yeTranskei), was an unrecognised state in the southeastern region of South Africa from 1976 to 1994. It was, along with Ciskei, a Ban ...

for most of their service lives and then having spent their last years in shunting service in

East London East or Orient is one of the four cardinal directions or points of the compass. It is the opposite direction from west and is the direction from which the Sun rises on the Earth. Etymology As in other languages, the word is formed from the f ...

Works numbers

The known works numbers for the eight NBL-built locomotives are recorded as 21248 to 21255. However, these numbers are in conflict with the NBL works numbers 21246 to 21275 which were allocated to thirty 2-8-2T locomotives, numbered and built by NBL for the Paris-Orleans Railway in France. Preceding and following NBL works numbers that are also in conflict with those recorded for the French locomotives are: * Works numbers 21246 and 21247 of the last two of six 45-class 0-6-2T locomotives built for the

Glasgow and South Western Railway The Glasgow and South Western Railway (G&SWR) was a railway company in Scotland. It served a triangular area of south-west Scotland between Glasgow, Stranraer and Carlisle. It was formed on 28 October 1850 by the merger of two earlier railway ...

in January 1916. * Works numbers 21256 to 21275 of twenty named ''Prince of Wales'' class 4-6-0 locomotives built for the

London and North Western Railway The London and North Western Railway (LNWR, L&NWR) was a British railway company between 1846 and 1922. In the late 19th century, the L&NWR was the largest joint stock company in the United Kingdom. In 1923, it became a constituent of the Lo ...

between October 1915 and January 1916. In the official NBL builders list, the Paris-Orleans 2-8-2Ts are shown as ordered in September 1915 and delivered from March to June 1916. Their duplicated works numbers are listed as "progressive numbers" 21246A to 21275A. The builders, works numbers, years of entering service and engine numbers of the Class MJ are listed in the table.

References

{{Steam locomotive tenders 2290 2290 2-6-6-0 locomotives (1C)C locomotives Maffei locomotives NBL locomotives Cape gauge railway locomotives Railway locomotives introduced in 1914 1914 in South Africa Scrapped locomotives