Data from DeGolyer, Vol 79, pp. 539+. Works number was 61553 in November 1930.
As can be seen from the dimensions, this was a very large engine for the Cape gauge. Firebox heating surface area included 14 sq ft (1.3 sq m) of arch tubes. Steam admission came through 10 inch (254 mm) piston valves.
It served a line that had very mild maximum grades (about 0.7%) and mimimum curve radii of 406 feet (123.75 metres) or 14 degrees. Nevertheless, Baldwin's specification included a requirement that the engine haul 650 tons up a 2% grade and 540 tons up 2/5%.
Delivered to North Natal, the Santa Fe tank later moved to Vryheid Coal & Iron.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 1 |
| Locobase ID | 3249 |
| Railroad | North Natal Navigation Collieries |
| Country | South Africa |
| Whyte | 2-10-2T |
| Number in Class | 1 |
| Road Numbers | 1 |
| Gauge | 3'6" |
| Number Built | 1 |
| Builder | Baldwin |
| Year | 1930 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 15.33 / 4.67 |
| Engine Wheelbase (ft / m) | 30.17 / 9.20 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.51 |
| Overall Wheelbase (engine & tender) (ft / m) | 30.17 / 9.20 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 155,904 / 70,717 |
| Engine Weight (lbs / kg) | 194,880 / 88,396 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | 194,880 / 88,396 |
| Tender Water Capacity (gals / ML) | 2400 / 9.09 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 3 / 3 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 52 / 26 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 42 / 1067 |
| Boiler Pressure (psi / kPa) | 210 / 1450 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 19" x 24" / 483x610 |
| Tractive Effort (lbs / kg) | 36,822 / 16702.20 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.23 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 148 - 2" / 51 |
| Flues (number - dia) (in / mm) | 28 - 5.375" / 137 |
| Flue/Tube length (ft / m) | 14.50 / 4.42 |
| Firebox Area (sq ft / m2) | 137 / 12.73 |
| Grate Area (sq ft / m2) | 30.80 / 2.86 |
| Evaporative Heating Surface (sq ft / m2) | 1811 / 168.25 |
| Superheating Surface (sq ft / m2) | 473 / 43.94 |
| Combined Heating Surface (sq ft / m2) | 2284 / 212.19 |
| Evaporative Heating Surface/Cylinder Volume | 229.94 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 6468 |
| Same as above plus superheater percentage | 7826 |
| Same as above but substitute firebox area for grate area | 34,812 |
| Power L1 | 12,604 |
| Power MT | 891.16 |