Wylam 0-4-0 Locomotives in Great_Britain
Class Details by Steve Llanso of Sweat House Media
Class Puffing Billy (Locobase 639)
Data from a Spanish-language site ([
]). See also "The Centenary of Hedley's "Puffing Billy", The Locomotive, Volume 19 (15 May 1913), pp. 104-106.
One of the earliest steam locomotives. Walking beams had shafts reaching down to small cranks on the frame; these drove an intermediate gear that distributed the piston force between the two axles through a larger gear that meshed directly with those on the two axles. The engine puffed because Hedley and Blackett attached blast pipes to each cylinder.
After its initial trials, Puffing Billy's weight was spread out over the 36 lb/yard (18 kg/metre) rail on two bogies, each of which carried four wheels. A diagram shows geared wheels meshed with similarly sized gears on all four axles, all driven by the single intermediate gear through the middle drive gear.
Poor steamer because of lack of good drafting.
Withal, the engine operated until 1862 and has been preserved.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Puffing Billy |
| Locobase ID | 639 |
| Railroad | Wylam |
| Country | Great Britain |
| Whyte | 0-4-0 |
| Number in Class | 3 |
| Road Numbers | |
| Gauge | 5' |
| Number Built | 3 |
| Builder | Hedley |
| Year | 1813 |
| Valve Gear | |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 6.23 / 1.90 |
| Engine Wheelbase (ft / m) | 6.23 / 1.90 |
| Ratio of driving wheelbase to overall engine wheelbase | 1 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 20,260 / 9190 |
| Engine Weight (lbs / kg) | 20,260 / 9190 |
| Tender Loaded Weight (lbs / kg) | 9110 / 4132 |
| Total Engine and Tender Weight (lbs / kg) | 29,370 / 13,322 |
| Tender Water Capacity (gals / ML) | |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 17 / 8.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 39 / 991 |
| Boiler Pressure (psi / kPa) | 50 / 340 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 9" x 36" / 229x914 |
| Tractive Effort (lbs / kg) | 3178 / 1441.52 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 6.38 |
| 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) | 5.16 / 0.48 |
| Evaporative Heating Surface (sq ft / m2) | 87 / 8.09 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 87 / 8.09 |
| Evaporative Heating Surface/Cylinder Volume | 32.82 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 258 |
| Same as above plus superheater percentage | 258 |
| Same as above but substitute firebox area for grate area | |
| Power L1 | |
| Power MT | |