Consolidated Main Reef Mine Beyer-Garratt Locomotives in South_Africa

Class Details by Steve Llanso of Sweat House Media

Class 2 (Locobase 537)

Data from Gavin Hamilton's excellent compilation of Garratt data posted at [] (6 September 2005); and A[rthur] E[dward] Durrant, Garratt Locomotives of the World (revised edition) (Newton Abbott, UK: David & Charles, 1981), p. 143. Works number was 6780 in 1935.

Prairie Garratt (works # 6780) for a mine located in Langlaagte,Transvaal State, Union of South Africa Durrant speculated that the 2 "may have been too powerful"; the CMRM soon sold the engine to New Raleigh Colliery, then by the New Clydesdale Colliery until scrapped in 1978.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID537
RailroadConsolidated Main Reef Mine
CountrySouth Africa
Number in Class1
Road Numbers2/1/5
Number Built1
BuilderBeyer, Peacock
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)31,360 / 14,225
Weight on Drivers (lbs / kg)183,008 / 83,011
Engine Weight (lbs / kg)257,040 / 116,592
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)257,040 / 116,592
Tender Water Capacity (gals / ML)4200 / 15.91
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 7.70 / 7
Minimum weight of rail (calculated) (lb/yd / kg/m)51 / 25.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)42 / 1067
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)17" x 22" / 432x559 (4)
Tractive Effort (lbs / kg)46,323 / 21011.78
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.95
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)172 / 15.99
Grate Area (sq ft / m2)41.90 / 3.89
Evaporative Heating Surface (sq ft / m2)2007 / 186.52
Superheating Surface (sq ft / m2)448 / 41.64
Combined Heating Surface (sq ft / m2)2455 / 228.16
Evaporative Heating Surface/Cylinder Volume173.63
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation7542
Same as above plus superheater percentage8900
Same as above but substitute firebox area for grate area36,533
Power L17520
Power MT543.54

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Wes Barris