London & Birmingham 2-2-2 Locomotives in Great_Britain

Class Details by Steve Llanso of Sweat House Media

Class Harvey Combs (Locobase 9916)

Data from Sekon, G A (George Augustus Nokes), The Evolution of the Steam Locomotive (1803 to 1898), 2nd Edition (London: The Railway Publishing Co., 1899), p. 60-61.

This locomotive was a "ballast" engine used during the railway's construction to shift the excavated earth. This 50-hp locomotive cost 1,400 pounds and had an unusual wheel arrangement for a construction engine. But the locomotive's availability for comparison testing with broad-gauge locomotives by Nicholas Wood of the Great Western allowed the Harvey Combs to put up the impressive speed of 25-53 mph pulling 81 tons and burning 0.47 lb of coke per ton mile.

Principal Dimensions by Steve Llanso of Sweat House Media

ClassHarvey Combs
Locobase ID9916
RailroadLondon & Birmingham
CountryGreat Britain
Number in Class1
Road Numbers
Number Built1
BuilderRobert Stephenson & Co
Valve Gear
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)
Weight on Drivers (lbs / kg)13,448 / 6100
Engine Weight (lbs / kg)26,656 / 12,091
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)
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)60 / 1524
Boiler Pressure (psi / kPa)40 / 2.80
High Pressure Cylinders (dia x stroke) (in / mm)12" x 18" / 305x457
Tractive Effort (lbs / kg)1469 / 666.33
Factor of Adhesion (Weight on Drivers/Tractive Effort) 9.15
Heating Ability
Tubes (number - dia) (in / mm)102 - 1.75" / 44
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 7.25 / 2.21
Firebox Area (sq ft / m2)50.72 / 4.71
Grate Area (sq ft / m2)10.23 / 0.95
Evaporative Heating Surface (sq ft / m2)390 / 36.23
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)390 / 36.23
Evaporative Heating Surface/Cylinder Volume165.52
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation409
Same as above plus superheater percentage409
Same as above but substitute firebox area for grate area2029
Power L11093
Power MT179.18

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