The reference for locomotives and railcars


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Central South African class 10
South African classes 10 and 10D
Great Britain | 1904 | 16 produced
Standard variant together with the management of North British
Standard variant together with the management of North British
Locomotive Magazine, June 1904

In 1904, the CSAR received 15 class 10 Pacifics from North British for express service. An innovation for South Africa, they had a wide firebox that was located behind the last driving axle and above the trailing axle. Due to its suitability for poorer coal and the possible greater power, this design quickly became established. Together with the class 11 Mikados, they were at the time the heaviest locomotives ever built for the Cape Gauge. This was only possible because the CSAR had laid heavier rails weighing 80 instead of 40 pounds per yard.

In 1910 another class 10 locomotive was placed into service, now supplied by ALCO. It was used to compare the locomotives otherwise sourced from Great Britain with American ones. This locomotive had a bar frame instead of the plate frame common to British manufacturers and was delivered directly with a superheater

class 10D by Baldwin
class 10D by Baldwin
SAR Museum

The 15 British machines were also retrofitted with a superheater in 1910. They were still called class 10 when renumbered by the SAR in 1912, while ALCO's single one formed class 10D. The latter was scrapped in 1931. The others were used on commuter and suburban trains from 1959 after some key main lines were electrified. They were retired by 1972 and two were preserved.

ManufacturerNorth BritishSARALCO
Axle config4-6-2 (Pacific) 
Gauge3 ft 6 in (Cape gauge)
Dimensions and Weights
Length64 ft 6 3/4 in62 ft 7 in
Length loco36 ft 11 in
Wheelbase30 ft 2 in29 ft 8 in
Fixed wheelbase10 ft 10 in11 ft 2 in
Total wheelbase56 ft 4 in55 ft
Service weight145,600 lbs162,960 lbs161,280 lbs
Adhesive weight110,460 lbs103,040 lbs108,976 lbs
Total weight256,060 lbs273,500 lbs265,776 lbs
Axle load33,700 lbs34,720 lbs36,960 lbs
Water capacity4,804 us gal
Fuel capacity22,000 lbs (coal)20,000 lbs (coal)
Power sourcesteam
Estimated power950 hp (708 kW)1,125 hp (839 kW)1,100 hp (820 kW)
Optimal speed24 mph26 mph38 mph
Starting effort24,962 lbf27,734 lbf18,501 lbf
Power Plant
Driver diameter62 in
Boiler pressure190 psi170 psi
Expansion typesimple
Cylinderstwo, 18 1/2 x 28 intwo, 19 1/2 x 28 intwo, 21 x 18 in
Grate area33 sq ft35 sq ft
Firebox area126 sq ft125 sq ft133 sq ft
Tube heating area1,716 sq ft1,463 sq ft1,848 sq ft
Evaporative heating area1,842 sq ft1,588 sq ft1,981 sq ft
Superheater area384 sq ft353 sq ft
Total heating area1,842 sq ft1,972 sq ft2,334 sq ft
Calculated Values
steam locomotive
last changed: 01/2024

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