Hopefield 2-6-0 Locomotives in South_Africa


Class Details by Steve Llanso of Sweat House Media

Class 1 / NG7 (Locobase 984)

Data from Baldwin Locomotive Works, Record of Recent Construction ((1903), No. 31, p. 30-31. See also DeGolyer, Volume 39, p. 297. Works numbers were 19456 in August 1901, 19649-19650 in October 1901. Much later the South African Railways added 36375, which was produced in April 1911.

Compared to other 2-foot Moguls, this was a powerhouse design with a big firebox. The 1911 spec state that these engines burned "colonial coal", 1 pound of which "evaporate[d] 5 1/2 lb of water."

Principal Dimensions by Steve Llanso of Sweat House Media

Class1 / NG7
Locobase ID984
RailroadHopefield (SAR)
CountrySouth Africa
Whyte2-6-0
Number in Class4
Road Numbers1-4/NG22-NG24, NG35
Gauge2'
Number Built4
BuilderBurnham, Williams & Co
Year1901
Valve Gear
Locomotive Length and Weight
Driver Wheelbase (ft / m)7 / 2.13
Engine Wheelbase (ft / m)12.83 / 3.91
Ratio of driving wheelbase to overall engine wheelbase 0.55
Overall Wheelbase (engine & tender) (ft / m)36.62 / 11.16
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)38,800 / 17,599
Engine Weight (lbs / kg)43,800 / 19,867
Tender Loaded Weight (lbs / kg)30,200 / 13,699
Total Engine and Tender Weight (lbs / kg)74,000 / 33,566
Tender Water Capacity (gals / ML)1500 / 5.68
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)22 / 11
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)33 / 838
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)11.75" x 16" / 298x406
Tractive Effort (lbs / kg)10,242 / 4645.70
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.79
Heating Ability
Tubes (number - dia) (in / mm)68 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)10.79 / 3.29
Firebox Area (sq ft / m2)42.60 / 3.96
Grate Area (sq ft / m2) 7.60 / 0.71
Evaporative Heating Surface (sq ft / m2)424 / 39.41
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)424 / 39.41
Evaporative Heating Surface/Cylinder Volume211.15
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1368
Same as above plus superheater percentage1368
Same as above but substitute firebox area for grate area7668
Power L13141
Power MT535.42

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