Central South African 4-6-4 Locomotives in South_Africa


Class Details by Steve Llanso of Sweat House Media

Class Class F (Locobase 2718)

Data from Holland (1972, I).

This tank engine used the same boiler, cylinders, and motion as the Pacific delivered to the CSAR at the same time. Differences in water and coal capacity underscore the short-haul role of this variation. Their livery and polished brasswork earned them the nickname of "Chocolate Boxes." Holland says that the designer, PA Hyde, told him in a letter that the F class and its 9th class tender-engine counterpart were two of his most successful designs.

Principal Dimensions by Steve Llanso of Sweat House Media

ClassClass F
Locobase ID2718
RailroadCentral South African
CountrySouth Africa
Whyte4-6-4T
Number in Class8
Road Numbers260-267
Gauge3'6"
Number Built8
BuilderVulcan Foundry
Year1903
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)11 / 3.35
Engine Wheelbase (ft / m)34.09 / 10.39
Ratio of driving wheelbase to overall engine wheelbase 0.32
Overall Wheelbase (engine & tender) (ft / m)34.09 / 10.39
Axle Loading (Maximum Weight per Axle) (lbs / kg)29,120 / 13,209
Weight on Drivers (lbs / kg)87,360 / 39,626
Engine Weight (lbs / kg)176,960 / 80,268
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)176,960 / 80,268
Tender Water Capacity (gals / ML)2160 / 8.18
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 3.30 / 3
Minimum weight of rail (calculated) (lb/yd / kg/m)49 / 24.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)54 / 1372
Boiler Pressure (psi / kPa)200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)18" x 26" / 457x660
Tractive Effort (lbs / kg)26,520 / 12029.28
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.29
Heating Ability
Tubes (number - dia) (in / mm)205 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)12.59 / 3.84
Firebox Area (sq ft / m2)131
Grate Area (sq ft / m2)21.75 / 2.02
Evaporative Heating Surface (sq ft / m2)1481 / 137.64
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1481 / 137.64
Evaporative Heating Surface/Cylinder Volume193.40
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4350
Same as above plus superheater percentage4350
Same as above but substitute firebox area for grate area26,200
Power L15021
Power MT380.13

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