Data from South African Class H1 4-8-2T" in Wikipedia at [], last accessed 13 July 2023.; and "Heavy Side Tank Locomotives for the Natal Government Railway", Railway Age, Volume XXXV [35], No 3 (15 January 1903), p 78, Dubs works numbers were 4088, 4099-4100 and Neilson, Reid & Company works numbers were 6196, 6206, 7213.
Wikipedia explains that these engines were part of a 25-engine addition to the original "Reid Ten-wheelers" described in Locobase 2714 Purchased by the Imperial Military Railways, the class became the E class in the Central South African Railways (CSAR) at the end of the Boer War. In 1912,
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | IMG H/E/H1 |
| Locobase ID | 11693 |
| Railroad | Imperial Military+ Railways |
| Country | South Africa |
| Whyte | 4-10-2T |
| Number in Class | 35 |
| Road Numbers | |
| Gauge | 3'6" |
| Number Built | 35 |
| Builder | several |
| Year | 1901 |
| Valve Gear | Allan |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | |
| Engine Wheelbase (ft / m) | 30.50 / 9.30 |
| Ratio of driving wheelbase to overall engine wheelbase | |
| Overall Wheelbase (engine & tender) (ft / m) | 24.75 / 7.54 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 27,440 / 12,447 |
| Weight on Drivers (lbs / kg) | 122,752 / 55,679 |
| Engine Weight (lbs / kg) | 154,224 / 69,955 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 2259 / 8.56 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 4.40 / 4 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 41 / 20.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 45 / 1143 |
| Boiler Pressure (psi / kPa) | 175 / 1210 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 19" x 27" / 483x686 |
| Tractive Effort (lbs / kg) | 32,219 / 14614.31 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.81 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 287 - 1.75" / 44 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 10.33 / 3.15 |
| Firebox Area (sq ft / m2) | 149 / 13.84 |
| Grate Area (sq ft / m2) | 21.50 / 2 |
| Evaporative Heating Surface (sq ft / m2) | 1494 / 138.80 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1494 / 138.80 |
| Evaporative Heating Surface/Cylinder Volume | 168.62 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 3763 |
| Same as above plus superheater percentage | 3763 |
| Same as above but substitute firebox area for grate area | 26,075 |
| Power L1 | 3317 |
| Power MT | 297.87 |