Data from D F Holland, Steam Locomotives of the South African Railways, Volume 2: 1910-1955 (1972). Works numbers were 27386-27405.
See Locobase 12790 for the South African "Dollies", the large class of Mountains built for the SAR from 1937 to 1953. This order was supplied by a different builder to the same design.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 316 |
| Locobase ID | 12791 |
| Railroad | Rhodesian Railways |
| Country | South Africa |
| Whyte | 4-8-2 |
| Number in Class | 20 |
| Road Numbers | 316-335 |
| Gauge | 3'6" |
| Number Built | 20 |
| Builder | Henschel & Sohn |
| Year | 1951 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 14.42 / 4.40 |
| Engine Wheelbase (ft / m) | 32.25 / 9.83 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.45 |
| Overall Wheelbase (engine & tender) (ft / m) | 58.62 / 17.87 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 31,248 / 14,174 |
| Weight on Drivers (lbs / kg) | 123,760 / 56,137 |
| Engine Weight (lbs / kg) | 178,304 / 80,877 |
| Tender Loaded Weight (lbs / kg) | 164,304 / 74,527 |
| Total Engine and Tender Weight (lbs / kg) | 342,608 / 155,404 |
| Tender Water Capacity (gals / ML) | 4250 / 16.10 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 10 / 9 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 52 / 26 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 54 / 1372 |
| Boiler Pressure (psi / kPa) | 200 / 1380 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 21" x 26" / 533x660 |
| Tractive Effort (lbs / kg) | 36,097 / 16373.34 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.43 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 76 - 2.5" / 64 |
| Flues (number - dia) (in / mm) | 24 - 5.5" / 140 |
| Flue/Tube length (ft / m) | 20.17 / 6.15 |
| Firebox Area (sq ft / m2) | 139 / 12.92 |
| Grate Area (sq ft / m2) | 36 / 3.35 |
| Evaporative Heating Surface (sq ft / m2) | 1839 / 170.91 |
| Superheating Surface (sq ft / m2) | 390 / 36.25 |
| Combined Heating Surface (sq ft / m2) | 2229 / 207.16 |
| Evaporative Heating Surface/Cylinder Volume | 176.44 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 7200 |
| Same as above plus superheater percentage | 8424 |
| Same as above but substitute firebox area for grate area | 32,526 |
| Power L1 | 10,438 |
| Power MT | 743.76 |