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 | |
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Class | Harvey Combs |
Locobase ID | 9916 |
Railroad | London & Birmingham |
Country | Great Britain |
Whyte | 2-2-2 |
Number in Class | 1 |
Road Numbers | |
Gauge | Std |
Number Built | 1 |
Builder | Robert Stephenson & Co |
Year | 1836 |
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 Volume | 165.52 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 409 |
Same as above plus superheater percentage | 409 |
Same as above but substitute firebox area for grate area | 2029 |
Power L1 | 1093 |
Power MT | 179.18 |