Data from Holland, Volume II, p. 32. Works numbers were 1060-1065 in 1915.
Data from Holland, Volume II, p. 33-34. Works numbers were 20854-20860 in 1917.
Holland reports that a severe shortage of locomotives from overseas led the SAR to look everywhere for engines to use on the Reef suburban services. The same conditions that affected SAR's importation also kept North British from completing a delivery to the Philippines' Manila Railway.
Adopting the K class proved a satisfactory solution, according to Holland, as "...they were well suited as they had rapid acceleration, were free-steaming and capable of relatively high speeds.
| Principal Dimensions by Steve Llanso of Middle Run Media | ||
|---|---|---|
| Class | J | K ("Manila") |
| Locobase ID | 13094 | 13095 |
| Railroad | South African Railways (SAR) | South African Railways (SAR) |
| Country | South Africa | South Africa |
| Whyte | 4-6-4T | 4-6-4T |
| Number in Class | 6 | 7 |
| Road Numbers | 341-346 | 347-353 |
| Gauge | 3'6" | 3'6" |
| Number Built | 6 | 7 |
| Builder | Nasmyth Wilson | North British |
| Year | 1915 | 1917 |
| Valve Gear | Walschaert | Walschaert |
| Locomotive Length and Weight | ||
| Driver Wheelbase (ft / m) | 8.50 / 2.59 | 12.25 / 3.73 |
| Engine Wheelbase (ft / m) | 27.42 / 8.36 | 32.87 / 10.02 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.31 | 0.37 |
| Overall Wheelbase (engine & tender) (ft / m) | 27.42 / 8.36 | 32.87 / 10.02 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 25,088 / 11,380 | 26,880 / 12,193 |
| Weight on Drivers (lbs / kg) | 73,248 / 33,225 | 80,640 / 36,578 |
| Engine Weight (lbs / kg) | 117,376 / 53,241 | 158,816 / 72,038 |
| Tender Loaded Weight (lbs / kg) | ||
| Total Engine and Tender Weight (lbs / kg) | ||
| Tender Water Capacity (gals / ML) | 1440 / 5.45 | 2820 / 10.68 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 3.30 / 3 | 4.40 / 4 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 41 / 20.50 | 45 / 22.50 |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter (in / mm) | 42.75 / 1086 | 48 / 1219 |
| Boiler Pressure (psi / kPa) | 175 / 1210 | 160 / 1100 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 15" x 22" / 381x559 | 17" x 24" / 432x610 |
| Tractive Effort (lbs / kg) | 17,224 / 7812.68 | 19,652 / 8914.01 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.25 | 4.10 |
| Heating Ability | ||
| Tubes (number - dia) (in / mm) | 171 - 1.75" / 44 | 85 - 1.875" / 48 |
| Flues (number - dia) (in / mm) | 21 - 5.25" / 133 | |
| Flue/Tube length (ft / m) | 10.56 / 3.22 | 12 / 3.66 |
| Firebox Area (sq ft / m2) | 88 / 8.18 | 118 / 10.97 |
| Grate Area (sq ft / m2) | 15 / 1.39 | 18.40 / 1.71 |
| Evaporative Heating Surface (sq ft / m2) | 909 / 84.48 | 962 / 89.41 |
| Superheating Surface (sq ft / m2) | 257 / 23.88 | |
| Combined Heating Surface (sq ft / m2) | 909 / 84.48 | 1219 / 113.29 |
| Evaporative Heating Surface/Cylinder Volume | 202.01 | 152.58 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 2625 | 2944 |
| Same as above plus superheater percentage | 2625 | 3562 |
| Same as above but substitute firebox area for grate area | 15,400 | 22,845 |
| Power L1 | 3738 | 7846 |
| Power MT | 337.52 | 643.51 |