Data from "Central South African Railway", Vol XI (15 December 1905), p. 210 and from D F Holland pp. 134-135.
When the CSAR took over the Natal Government Railway's rolling stock, the new railroad studied the Reid "Ten-wheeler" 4-10-2Ts originally produced for the Imperial Military Railways and remedied a meager water and coal supply with some major surgery. The trailing truck and the rearmost driven axle were removed and the 6-wheel tender from some retiring 4th class locomotives added. So although the engine still had 2,256 US gallons in the side tanks that flanked the boiler, it trailed an additional 2,928 US gallons.
Data from "Central South African Railway", Locomotive Magazine, Vol XI (15 December 1905), p. 210. See also [], last accessed 7 February 2016.
The photograph shows 381, which came from the class that would be designated Class 7B in the South African Railway system. This particular engine was updated by the SAR by installing a larger round-top boiler. According to Wikipedia's entry on the SAR's Class 7 engines, the increased capacity gave it the power of an 8th class locomotive, but "the cost of modifying the frame and problems with overloaded bearings led to a decision not to convert any of the others."
Principal Dimensions by Steve Llanso of Middle Run Media | ||
---|---|---|
Class | 13 | 7th class - reboilered |
Locobase ID | 10541 | 10540 |
Railroad | Central South African Railways | Central South African Railways |
Country | South Africa | South Africa |
Whyte | 4-8-0T+6 | 4-8-0 |
Number in Class | 29 | 1 |
Road Numbers | 381/1058 | |
Gauge | 3'6" | 3'6" |
Number Built | ||
Builder | CSAR | Dubs & Co |
Year | 1902 | 1900 |
Valve Gear | Allan | Stephenson |
Locomotive Length and Weight | ||
Driver Wheelbase (ft / m) | 12.50 / 3.81 | 12 / 3.66 |
Engine Wheelbase (ft / m) | 21.33 / 6.50 | 21.29 / 6.49 |
Ratio of driving wheelbase to overall engine wheelbase | 0.59 | 0.56 |
Overall Wheelbase (engine & tender) (ft / m) | 43.04 / 13.12 | 46.87 / 14.29 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | 30,912 / 14,021 | 24,920 / 11,304 |
Weight on Drivers (lbs / kg) | 116,704 / 52,936 | 93,632 / 42,471 |
Engine Weight (lbs / kg) | 135,744 / 61,573 | 119,364 / 54,143 |
Tender Loaded Weight (lbs / kg) | 67,984 / 30,837 | 76,384 / 34,647 |
Total Engine and Tender Weight (lbs / kg) | 203,728 / 92,410 | 195,748 / 88,790 |
Tender Water Capacity (gals / ML) | 2060 / 7.80 | 3120 / 11.82 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 6 | 6 / 6 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 39 / 19.50 | |
Geometry Relating to Tractive Effort | ||
Driver Diameter (in / mm) | 45 / 1143 | 42.75 / 1086 |
Boiler Pressure (psi / kPa) | 160 / 1100 | 180 / 1240 |
High Pressure Cylinders (dia x stroke) (in / mm) | 19" x 27" / 483x686 | 17" x 23" / 432x584 |
Tractive Effort (lbs / kg) | 29,458 / 13361.94 | 23,789 / 10790.52 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.96 | 3.94 |
Heating Ability | ||
Tubes (number - dia) (in / mm) | 287 - 1.75" / 44 | 200 - 2" / 51 |
Flues (number - dia) (in / mm) | ||
Flue/Tube length (ft / m) | 10.33 / 3.15 | 10.75 / 3.28 |
Firebox Area (sq ft / m2) | 134.80 / 12.53 | 122.20 / 11.35 |
Grate Area (sq ft / m2) | 21.15 / 1.97 | 17.20 / 1.60 |
Evaporative Heating Surface (sq ft / m2) | 1494 / 138.85 | 1248 / 115.94 |
Superheating Surface (sq ft / m2) | ||
Combined Heating Surface (sq ft / m2) | 1494 / 138.85 | 1248 / 115.94 |
Evaporative Heating Surface/Cylinder Volume | 168.62 | 206.54 |
Computations Relating to Power Output (More Information) | ||
Robert LeMassena's Power Computation | 3384 | 3096 |
Same as above plus superheater percentage | 3384 | 3096 |
Same as above but substitute firebox area for grate area | 21,568 | 21,996 |
Power L1 | 2936 | 3946 |
Power MT | 371.64 |