| South African Class 19 4-8-2 & South African Class 19R 4-8-2 |
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| 1369 plinthed in Breyten, Mpumalanga, 11 June 2005 | |
| Power type | Steam |
| Designer | South African Railways |
| Builder | Berliner Maschinenbau |
| Serial number | 9279-9282[1] |
| Model | Class 19 |
| Build date | 1928 |
| Total produced | 4 |
| Configuration | 4-8-2 "Mountain" |
| Gauge | 3 ft 6 in (1,067 mm) Cape gauge |
| Leading wheel diameter |
28.5 in (724 mm) |
| Driver diameter | 54 in (1,370 mm) |
| Trailing wheel diameter |
33 in (838 mm) |
| Wheelbase | Total: 58 ft 7.75 in (17.875 m) Engine: 6 ft 2 in (1.880 m) pilot 14 ft 5 in (4.394 m) coupled 32 ft 2 in (9.804 m) total Tender: 4 ft 7 in (1.397 m) bogie 16 ft 9 in (5.105 m) total |
| Length | 67 ft 5.5 in (20.561 m) total |
| Height | 12 ft 10 in (3.912 m) as built 12 ft 10.875 in (3.934 m) reboilered |
| Frame | Bar frame |
| Axle load | 13.45 long tons (13.7 t) on 3rd driver as built 12.95 long tons (13.2 t) on 3rd driver reboilered |
| Weight on drivers | 53.05 long tons (53.9 t) as built 51.1 long tons (51.9 t) reboilered |
| Locomotive weight | 79.45 long tons (80.7 t) as built 75.9 long tons (77.1 t) reboilered |
| Tender weight | 49,452 lb (22.4 t) empty 51.05 long tons (51.9 t) w/o |
| Locomotive & tender combined weight |
160,100 lb (72.6 t) empty 130.5 long tons (132.6 t) w/o |
| Tender type | MP1 - MP, MP1, MR, MX, MY, MY1 permitted * 2 axle bogies * Wheels 34 in (864 mm) dia * Length 25 ft 10.5 in (7.887 m) |
| Water capacity | 4,250 imp gal (19,300 l) |
| Boiler | 5 ft (1.524 m) int dia 20 ft 2 in (6.147 m) int length 8 ft (2.438 m) pitch |
| Boiler pressure | 200 psi (1,380 kPa) |
| Firegrate area | 37 sq ft (3.437 m2) as built 36 sq ft (3.345 m2) reboilered |
| Heating surface: Tubes |
As built: 120 tubes 2.25 in (57.2 mm) ext dia 21 tubes 5.5 in (140 mm) ext dia 2,036 sq ft (189.151 m2) Reboilered: 76 tubes 2.5 in (63.5 mm) ext dia 24 tubes 5.5 in (140 mm) ext dia 1,700 sq ft (157.935 m2) |
| Heating surface: Flues |
13 sq ft (1.208 m2) as built 16 sq ft (1.486 m2) reboilered |
| Heating surface: Firebox |
127 sq ft (11.799 m2) as built 123 sq ft (11.427 m2) reboilered |
| Heating surface: Total |
2,176 sq ft (202.157 m2) as built 1,839 sq ft (170.849 m2) reboilered |
| Superheater area | 506 sq ft (47.009 m2) as built 404 sq ft (37.533 m2) reboilered |
| Cylinders | Two |
| Cylinder size | 21 in (533 mm) bore 26 in (660 mm) stroke |
| Valve gear | Walschaerts |
| Tractive effort | 31,850 lbf (141.7 kN) at 75% boiler pressure[2] |
| Career | South African Railways |
| Class | Class 19, Class 19R |
| Number in class | 4 |
| Number | 1366–1369 |
| Delivered | 1928 |
| First run | 1928 |
| Withdrawn | 1977[3] |
| Disposition | Retired |
In 1928 the South African Railways placed four Class 19 steam locomotives with a 4-8-2 wheel arrangement in service. One of them was later reboilered and reclassified to Class 19R.[2]
Contents |
At the request of Colonel F.R. Collins, Chief Mechanical Engineer (CME) of the South African Railways (SAR) from 1922 to 1929, the basic design of the Class 19 4-8-2 steam locomotive was done by Test Engineer M.M. Loubser, himself later to be appointed as CME from 1939 to 1949. Four locomotives were built in 1928 by Berliner Maschinenbau AG (BMAG), the former L. Schwartzkopff, in Berlin, numbered 1366 to 1369.[3][4]
They were superheated, built on bar frames and used Walschaerts valve gear. Built as a lighter branch line development of the earlier Class 15C and Class 15CA 4-8-2 main line locomotives, they proved to be extremely successful. Following the pilot project with the four Class 19 locomotives, four variants on the class were acquired over the next twenty-one years.[3][5]
The Class 19 family earned a reputation for reliability, easy handling, long periods between overhauls and economical operation. In preparing the specifications, Loubser gave considerable thought to the layout of this locomotive that was essentially a completely new type of branch line locomotive. The Research and Test Department was consulted on the most suitable wheel arrangement and other design details, and the end result more than justified the amount of care and thought taken during the design process.[1]
During 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.[2][3]
In 1966, when Class 19 1367 was reboilered with a Watson Standard no. 1A boiler, it became the sole Class 19R. 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.[2][3]
The Watson Standard no. 1A boiler was designed to the same basic dimensions of the Class 19 boiler, but with more superheater elements and a different tube arrangement with larger diameter small tubes.[5]
The four Class 19 locomotives were placed in service on the line between Kimberley and Vryburg, but eventually spent their later working years at Empangeni and on the Bergville branch in Natal. By 1977 they were all withdrawn from service. One, the reboilered Class 19R 1367, was sold into industrial service, becoming the Number 2 of Platberg Colliery in Natal.[3][5]
The main picture shows number 1369, probably the sole surviving Class 19, serving as the town guard at Breyten in Mpumalanga[6]
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