Cape Government 2-6-4 Locomotives in South_Africa


Class Details by Steve Llanso of Sweat House Media

Class A/NG25 (Locobase 987)

Data from "CGR Type A 2-6-4T" in Wikipedia at [link], last accessed 3 August 2023. Works numbers were 1564-1565 in September 1902.

Unusual "Adriatic" wheel arrangement in a pair of tank locomotives bought to serve the new Avontuur Railway which ran west-northwest from Port Elizabeth's Homewood Road to the namesake termination

Renumbered NG25-NG26, the pair satisfied traffic demands until the SAR retired them in 1929.

Principal Dimensions by Steve Llanso of Middle Run Media
ClassA/NG25
Locobase ID987
RailroadCape Government (SAR)
CountrySouth Africa
Whyte2-6-4T
Number in Class2
Road Numbers31-32/NG25-NG26
Gauge2'
Number Built2
BuilderManning Wardle
Year1902
Valve Gear
Locomotive Length and Weight
Driver Wheelbase (ft / m)6
Engine Wheelbase (ft / m)20.75
Ratio of driving wheelbase to overall engine wheelbase 0.29
Overall Wheelbase (engine & tender) (ft / m)20.75
Axle Loading (Maximum Weight per Axle) (lbs / kg)18,704
Weight on Drivers (lbs / kg)
Engine Weight (lbs / kg)91,952 / 41,709
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)1200
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 2.20
Minimum weight of rail (calculated) (lb/yd / kg/m)
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)33 / 838
Boiler Pressure (psi / kPa)180 / 1240
High Pressure Cylinders (dia x stroke) (in / mm)13" x 16" / 330x406
Tractive Effort (lbs / kg)12,537 / 5686.69
Factor of Adhesion (Weight on Drivers/Tractive Effort)
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)
Grate Area (sq ft / m2)12
Evaporative Heating Surface (sq ft / m2)
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)
Evaporative Heating Surface/Cylinder Volume
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2160
Same as above plus superheater percentage2160
Same as above but substitute firebox area for grate area
Power L1
Power MT

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