Data from "Locomotives of the Otavi Ry" The Locomotive Magazine, Vol XIII (15 August 1907), p.147. Works numbers were 707-716 and 804-808.
When it was completed, the Otavi Railway was the longest 60-cm line in the world at 567 km (352 miles). The engineering firm of Arthur Koppel required less than 3 years to lay enough 30-lb (15-kg) rail to open it for business. In part, the rapidity was due to the relatively unchallenging gradients, the steepest of which was 2% and the curvature was relatively gentle given the gauge at about 150 metres (500 ft). Event the ballast was locally "grown", being made up primarily of quartz sand. There were, however, about 110 bridges and 42 sidings.
This class included the 15 Jungs shown in the specifications and 10 similar Henschel & Sohn Ha-class engines (works numbers 6596-7004) delivered in 1904. See Locobase 10622 for the larger Hb class.
The railway's gauge was later increased to 1,067-mm (3' 6"). The surviving Jungs moved to the Tsumeb 2'-gauge line; some of these operated on that line until 1951.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Jung |
| Locobase ID | 10621 |
| Railroad | Otavi |
| Country | German East Africa |
| Whyte | 0-6-2T |
| Number in Class | 20 |
| Road Numbers | 1-15 |
| Gauge | 60 cm |
| Number Built | 20 |
| Builder | Jung |
| Year | 1903 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 5.58 / 1.70 |
| Engine Wheelbase (ft / m) | 11.48 / 3.50 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.49 |
| Overall Wheelbase (engine & tender) (ft / m) | 11.48 / 3.50 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | |
| Engine Weight (lbs / kg) | 50,045 / 22,700 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 924 / 3.50 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 1.10 / 1 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 27.60 / 700 |
| Boiler Pressure (psi / kPa) | 203.10 / 1400 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 11.81" x 13.78" / 300x350 |
| Tractive Effort (lbs / kg) | 12,022 / 5453.09 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 108 - 1.732" / 44 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 8.86 / 2.70 |
| Firebox Area (sq ft / m2) | 62.95 / 5.85 |
| Grate Area (sq ft / m2) | 8.61 / 0.80 |
| Evaporative Heating Surface (sq ft / m2) | 495 / 46 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 495 / 46 |
| Evaporative Heating Surface/Cylinder Volume | 283.32 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1749 |
| Same as above plus superheater percentage | 1749 |
| Same as above but substitute firebox area for grate area | 12,785 |
| Power L1 | 4330 |
| Power MT | |