Central South African Railways 4-8-0 Locomotives in South_Africa


Class Details by Steve Llanso of Sweat House Media

Class 13 (Locobase 10541)

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.


Class 7th class - reboilered (Locobase 10540)

Data from "Central South African Railway", Locomotive Magazine, Vol XI (15 December 1905), p. 210. See also [link], 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
Class137th class - reboilered
Locobase ID10541 10540
RailroadCentral South African RailwaysCentral South African Railways
CountrySouth AfricaSouth Africa
Whyte4-8-0T+64-8-0
Number in Class291
Road Numbers381/1058
Gauge3'6"3'6"
Number Built
BuilderCSARDubs & Co
Year19021900
Valve GearAllanStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)12.50 / 3.8112 / 3.66
Engine Wheelbase (ft / m)21.33 / 6.5021.29 / 6.49
Ratio of driving wheelbase to overall engine wheelbase 0.59 0.56
Overall Wheelbase (engine & tender) (ft / m)43.04 / 13.1246.87 / 14.29
Axle Loading (Maximum Weight per Axle) (lbs / kg)30,912 / 14,02124,920 / 11,304
Weight on Drivers (lbs / kg)116,704 / 52,93693,632 / 42,471
Engine Weight (lbs / kg)135,744 / 61,573119,364 / 54,143
Tender Loaded Weight (lbs / kg)67,984 / 30,83776,384 / 34,647
Total Engine and Tender Weight (lbs / kg)203,728 / 92,410195,748 / 88,790
Tender Water Capacity (gals / ML)2060 / 7.803120 / 11.82
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)66 / 6
Minimum weight of rail (calculated) (lb/yd / kg/m)39 / 19.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)45 / 114342.75 / 1086
Boiler Pressure (psi / kPa)160 / 1100180 / 1240
High Pressure Cylinders (dia x stroke) (in / mm)19" x 27" / 483x68617" x 23" / 432x584
Tractive Effort (lbs / kg)29,458 / 13361.9423,789 / 10790.52
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.96 3.94
Heating Ability
Tubes (number - dia) (in / mm)287 - 1.75" / 44200 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)10.33 / 3.1510.75 / 3.28
Firebox Area (sq ft / m2)134.80 / 12.53122.20 / 11.35
Grate Area (sq ft / m2)21.15 / 1.9717.20 / 1.60
Evaporative Heating Surface (sq ft / m2)1494 / 138.851248 / 115.94
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1494 / 138.851248 / 115.94
Evaporative Heating Surface/Cylinder Volume168.62206.54
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation33843096
Same as above plus superheater percentage33843096
Same as above but substitute firebox area for grate area21,56821,996
Power L129363946
Power MT371.64

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