Cape Government 4-4-2 Locomotives in South_Africa


Class Details by Steve Llanso of Sweat House Media

Class 04 "Hatrack" (Locobase 2713)

Data from "An American Locomotive for South Africa", Engineering News, Volume 38 (28 October 1897), pp. 277-278 and DeGolyer, Volume 21, p. 25. See also A E Durrant, The Smoke That Thunders (Harare, Zimbabwe: African Publishing Group, 1997), p. 50. Works numbers were 15338-15543 in May 1897.

Relatively large engines for the Cape gauge supplied by an American builder at a time when European builders were overwhelmed by orders. It's an unusual-looking Atlantic, having relatively small drivers in proportion to the boiler and cab. But Baldwin took full advantage of positioning the firebox over the small trailing axle, whose wheels measured 33" (838 mm), and produced a short, but quite wide (60"/1,524 mm) furnace.

According to Holland (1972, I), in service these engines "were found to be free of any vices, low in maintenance costs, free running, and had excellent steaming qualities. They became great favourites with the engine crews, who dubbed them "Hatracks" because of their appearance." Hiroshi Takagi, a Japanese steam locomotive historian, suggests that the nickname came from their having a relatively slender boiler.

"Dusty" Durrant asserted a leading role for this accidental South African import: They were "especially, were the forerunners of all modern locomotives in Southern Africa, and [H M] Beatty then turned entirely to bar framed locomotives, belatedly following their other excellent feature, the wide firebox."

Principal Dimensions by Steve Llanso of Sweat House Media

Class04 "Hatrack"
Locobase ID2713
RailroadCape Government
CountrySouth Africa
Whyte4-4-2
Number in Class6
Road Numbers295-300
Gauge3'6"
Number Built6
BuilderBurnham, Williams & Co
Year1897
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)6 / 1.83
Engine Wheelbase (ft / m)22.50 / 6.86
Ratio of driving wheelbase to overall engine wheelbase 0.27
Overall Wheelbase (engine & tender) (ft / m)45.71 / 13.93
Axle Loading (Maximum Weight per Axle) (lbs / kg)27,216 / 12,345
Weight on Drivers (lbs / kg)53,200 / 24,131
Engine Weight (lbs / kg)100,352 / 45,519
Tender Loaded Weight (lbs / kg)63,000 / 28,576
Total Engine and Tender Weight (lbs / kg)163,352 / 74,095
Tender Water Capacity (gals / ML)3600 / 13.64
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 4.73 / 4
Minimum weight of rail (calculated) (lb/yd / kg/m)44 / 22
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)56 / 1422
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)16" x 22" / 406x559
Tractive Effort (lbs / kg)15,387 / 6979.43
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.46
Heating Ability
Tubes (number - dia) (in / mm)189 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)14.82 / 4.52
Firebox Area (sq ft / m2)98.15 / 9.12
Grate Area (sq ft / m2)30 / 2.79
Evaporative Heating Surface (sq ft / m2)1560 / 144.93
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1560 / 144.93
Evaporative Heating Surface/Cylinder Volume304.71
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5400
Same as above plus superheater percentage5400
Same as above but substitute firebox area for grate area17,667
Power L16730
Power MT557.79

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