South African Railways 4-6-4 Locomotives in South_Africa


Class Details by Steve Llanso of Sweat House Media

Class J (Locobase 13094)

Data from Holland, Volume II, p. 32. Works numbers were 1060-1065 in 1915.


Class K ("Manila") (Locobase 13095)

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 Sweat House Media

ClassJK ("Manila")
Locobase ID13094 13095
RailroadSouth African Railways (SAR)South African Railways (SAR)
CountrySouth AfricaSouth Africa
Whyte4-6-4T4-6-4T
Number in Class67
Road Numbers341-346347-353
Gauge3'6"3'6"
Number Built67
BuilderNasmyth WilsonNorth British
Year19151917
Valve GearWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m) 8.50 / 2.5912.25 / 3.73
Engine Wheelbase (ft / m)27.42 / 8.3632.87 / 10.02
Ratio of driving wheelbase to overall engine wheelbase 0.31 0.37
Overall Wheelbase (engine & tender) (ft / m)27.42 / 8.3632.87 / 10.02
Axle Loading (Maximum Weight per Axle) (lbs / kg)25,088 / 11,38026,880 / 12,193
Weight on Drivers (lbs / kg)73,248 / 33,22580,640 / 36,578
Engine Weight (lbs / kg)117,376 / 53,241158,816 / 72,038
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)117,376 / 53,241158,816 / 72,038
Tender Water Capacity (gals / ML)1440 / 5.452820 / 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 / 20.5045 / 22.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)42.75 / 108648 / 1219
Boiler Pressure (psi / kPa)175 / 12.10160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)15" x 22" / 381x55917" x 24" / 432x610
Tractive Effort (lbs / kg)17,224 / 7812.6819,652 / 8914.01
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.25 4.10
Heating Ability
Tubes (number - dia) (in / mm)171 - 1.75" / 4485 - 1.875" / 48
Flues (number - dia) (in / mm)21 - 5.25" / 133
Flue/Tube length (ft / m)10.56 / 3.2212 / 3.66
Firebox Area (sq ft / m2)88 / 8.18118 / 10.97
Grate Area (sq ft / m2)15 / 1.3918.40 / 1.71
Evaporative Heating Surface (sq ft / m2)909 / 84.48962 / 89.41
Superheating Surface (sq ft / m2)257 / 23.88
Combined Heating Surface (sq ft / m2)909 / 84.481219 / 113.29
Evaporative Heating Surface/Cylinder Volume202.01152.58
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation26252944
Same as above plus superheater percentage26253562
Same as above but substitute firebox area for grate area15,40022,845
Power L137387846
Power MT337.52643.51

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