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South African class 12A
South Africa | 1919 | 75 produced
No. 1548 on a Henschel works photo
No. 1548 on a Henschel works photo
collection Leith Paxton
Variant12Arebuilt 12AR
General
Built1919-1929
ManufacturerNorth British, Henschel
Axle config4-8-2 (Mountain) 
Gauge3 ft 6 in (Cape gauge)
Dimensions and Weights
Length66 ft 11 5/8 in69 ft 7 in
Wheelbase32 ft 1 in
Fixed wheelbase13 ft 6 in
Total wheelbase58 ft 7 1/4 in61 ft 7 3/8 in
Service weight221,785 lbs222,226 lbs
Adhesive weight154,897 lbs154,456 lbs
Total weight336,205 lbs370,156 lbs
Axle load38,757 lbs38,978 lbs
Water capacity5,104 us gal7,206 us gal
Fuel capacity22,400 lbs (coal)26,880 lbs (coal)
Power
Power sourcesteam
Estimated power1,300 hp (969 kW)
Optimal speed17 mph
Starting effort47,424 lbf
Power Plant
Driver diameter51 in
Boiler pressure190 psi
Expansion typesimple
Cylinderstwo, 24 x 26 in
Boiler
Grate area40.5 sq ft41 sq ft
Firebox area209 sq ft164 sq ft
Tube heating area2,301 sq ft2,338 sq ft
Evaporative heating area2,510 sq ft2,502 sq ft
Superheater area466 sq ft480 sq ft
Total heating area2,976 sq ft2,982 sq ft
Calculated Values
steam locomotive
freight
passenger
last changed: 09 2023
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