Cape Government 0-4-0 Locomotives in South_Africa

Class Details by Steve Llanso of Sweat House Media

Class Midget Type C/NG20 (Locobase 982)

Data from diagram drawn by Sidney Moir in 1960 of Cape Government Railway Department, Avontuur Railway Type C, reproduced by Piet Conradie as part of his 17 May 2009 post to his old Steam Locomotives in South Africa blog at [], last accessed 1 June 2015. Wikipedia at , last accessed 1 June 2015. Works number was 1583 in November 1902.

This single engine operated both as a switcher and as the motive power for short (2-carriage) passenger trains from Port Elizabeth on west to Avontuur in the Langkloof. Piet Conradie amplifies on these operations, saying that the Midget and its stablemate Krauss 0-4-0T "were frequently sent out on the mainline during the weekends, each handling a single coach with excursionists bound for Greenbushes or Van Staden's Gorge. The fact that water tanks, drawing their supplies from wells, either by means of windmills or hand-operated pumps, had been erected every five miles or so, made these ventures possible."

Two points from the diagram deserve mention: 1) the relatively large external diameters of the 49 boiler tubes, and 2) the high factor of adhesion.

After retirement, the Midget was restored in the 1980s and put into service at the Crown Mine Museum. Later she w

Principal Dimensions by Steve Llanso of Sweat House Media

ClassMidget Type C/NG20
Locobase ID982
RailroadCape Government
CountrySouth Africa
Number in Class1
Road Numbers41/NG20
Number Built1
BuilderManning Wardle
Valve Gear
Locomotive Length and Weight
Driver Wheelbase (ft / m) 4.50 / 1.37
Engine Wheelbase (ft / m) 4.50 / 1.37
Ratio of driving wheelbase to overall engine wheelbase1
Overall Wheelbase (engine & tender) (ft / m) 4.50 / 1.37
Axle Loading (Maximum Weight per Axle) (lbs / kg)16,800 / 7620
Weight on Drivers (lbs / kg)33,600 / 15,241
Engine Weight (lbs / kg)33,600 / 15,241
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)33,600 / 15,241
Tender Water Capacity (gals / ML)480 / 1.82
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 0.25
Minimum weight of rail (calculated) (lb/yd / kg/m)28 / 14
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)26 / 660
Boiler Pressure (psi / kPa)140 / 9.70
High Pressure Cylinders (dia x stroke) (in / mm)9" x 14" / 229x356
Tractive Effort (lbs / kg)5190 / 2354.15
Factor of Adhesion (Weight on Drivers/Tractive Effort) 6.47
Heating Ability
Tubes (number - dia) (in / mm)49 - 2.125" / 54
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 8.75 / 2.67
Firebox Area (sq ft / m2)30 / 2.79
Grate Area (sq ft / m2)5 / 0.46
Evaporative Heating Surface (sq ft / m2)254 / 23.60
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)254 / 23.60
Evaporative Heating Surface/Cylinder Volume246.40
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation700
Same as above plus superheater percentage700
Same as above but substitute firebox area for grate area4200
Power L12378
Power MT312.06

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