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The South African Railways Class 19D 4-8-2 of 1937 was a steam locomotive.
Between 1937 and 1949, the South African Railways placed 235 Class 19D steam locomotives with a 4-8-2 Mountain type wheel arrangement in service.
Model: Class 19D
Total produced: 268
In 1928, the South African Railways placed four Class 19 steam locomotives with a 4-8-2 Mountain type wheel arrangement in service. They were the forerunners of a family of light-rail branch line engines which would remain in service until the very end of the steam era. One of them was later reboilered with a Watson Standard boiler and reclassified to Class 19R.
Col F.R. Collins DSO
Until 1928, the bulk of light 60 pounds per yard (30 kilograms per metre) branch line traffic on the South African Railways (SAR) was hauled by Classes 6, 7 and 8 locomotives. Due to the increase in traffic during the late 1920s, the need arose for a new and heavier type of branch line locomotive.
At the request and under the direction of Colonel F.R. Collins DSO, Chief Mechanical ngineer (CME) of the SAR from 1922 to 1929, the basic design of the new Class 19 4-8-2 steam locomotive was done by Research and Test Engineer M.M. Loubser, himself later to be appointed as CME from 1939 to 1949. In 1928, four locomotives were built in Germany by Berliner Maschinenbau AG (BMAG), the former L. Schwartzkopff. They were delivered and placed in service during that same year.
The locomotives, numbered in the range from 1366 to 1369, were in essence a lighter branch line development of the earlier Classes 15CB and 15CA heavy 4-8-2 mainline locomotives and proved to be extremely successful. They were approximately 50% more powerful than the Class 8 family and also had better speed with their larger diameter coupled wheels. They were superheated, built on bar frames and their piston valves were actuated by Walschaerts valve gear.
A feature which was to be followed for all subsequent SAR locomotives was their relatively large firegrate area of 37 square feet (3.4 square metres). The round-topped firebox had flexible stays fitted in the breaking zones. Three support brackets tied the boiler barrel to the main bar frames. As far as practicable, mountings were fixed to a steam stand on the firebox top and fitted with extensions to the spindles to carry the handles inside the cab, within easy reach of the enginemen.
The cylinders drove on the second pair of coupled wheels. The locomotives were fitted with the single slide-bar type piston crossheads, popular in Europe but prone to rapid wear under South African conditions. The valve spindle crossheads were screwed to the ends of the valve spindles and secured with locknuts. Although this made adjustment easier, it was not satisfactory in service and was later replaced by the usual taper fit with cotter pin. With these two exceptions, the mechanical parts of the Class 19 gave very little trouble.
As built, the Class 19 was delivered with Type MS tenders with an 11 long tons (11.2 tonnes) coal and a 5,000 imperial gallons (22,700 litres) water capacity and an axle load of 14 long tons 14 hundredweight (14,940 kilograms).
Following the pilot project with only four Class 19 locomotives, four variants on the class were acquired over the next twenty-one years.
The slightly smaller Class 19A in 1929.
The Class 19B in 1930.
The Class 19C in 1935.
The Class 19D between 1936 and 1949.
The Class 19 family earned a reputation for reliability, easy handling, long periods between overhauls and economical operation. While preparing the specifications, Loubser gave considerable thought to the layout of this locomotive and the Research and Test Department was consulted on the most suitable wheel arrangement and other design details. The end result more than justified the amount of care and thought taken during the design process.
From the 1930s, many serving locomotives were reboilered with a standard boiler type designed by then CME A.G. Watson as part of his standardisation policy. Such Watson Standard reboilered locomotives were reclassified by adding an "R" suffix to their classification.
In 1966, when Class 19 no. 1367 was reboilered with a Watson Standard no. 1A boiler, it became the sole Class 19R. The Watson Standard no. 1A boiler was designed to the same basic dimensions as the Class 19 boiler, but with more superheater elements, a different tube arrangement and larger diameter small tubes. In the process of reboilering, no. 1367 was also equipped with a Watson cab with its distinctive inclined front compared to the conventional vertical front of the original cab.
While an obvious visual difference between an original and a Watson Standard reboilered locomotive is usually a rectangular regulator cover just to the rear of the chimney on the reboilered locomotive, the slanted front of the new cab on no. 1367 served as an even more obvious identifying feature.
The four Class 19 locomotives were placed in service on the line between Kimberley and Vryburg, but they eventually spent their later working years at Empangeni and on the Bergville branch in Natal. In the 1950s, they were used especially on passenger trains between Machadodorp via Breyten to Vryheid. Some later exchanged their Type MS tenders for lighter modified Type MP1 tenders. By 1977, they were all withdrawn from service. No. 1369, with a Type MP1 tender, was plinthed in Breyten in Mpumalanga. One engine, the reboilered Class 19R no. 1367, was sold into industrial service in Natal and became the Platberg Colliery no. 2.
SAR Class 19D with MP Tender
- Brand: Mini World Models (South Africa)
- Product Code: SAR Class 19D with MP Tender
- Availability: In Stock
Tags: SAR Class 19D with MP Tender