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 Middle Run Media | |
|---|---|
| Class | Midget Type C/NG20 |
| Locobase ID | 982 |
| Railroad | Cape Government |
| Country | South Africa |
| Whyte | 0-4-0T |
| Number in Class | 1 |
| Road Numbers | 41/NG20 |
| Gauge | 2' |
| Number Built | 1 |
| Builder | Manning Wardle |
| Year | 1902 |
| 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 wheelbase | 1 |
| 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 / 970 |
| 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 Volume | 246.40 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 700 |
| Same as above plus superheater percentage | 700 |
| Same as above but substitute firebox area for grate area | 4200 |
| Power L1 | 2378 |
| Power MT | 312.06 |