Data from Ahrons (1927)
This locomotive is notable chiefly for its radial axle boxes on the leading and trailing trucks. Designed by W. Bridges Adams, the trucks had 4 1/2" of lateral play and moved in a curved guide whose radius was derived from the distance to the first coupled axle. Although the White Raven proved too loose because there was no centering mechanism, the basic Adams radial design influenced all subsequent radial axle designs.
When the St. Helens was absorbed by the London & North Western in 1864, the White Raven was converted to a 2-4-0, rigid-truck tender engine and renumbered 1387. In 1867 it received 1226, in 1872 the number became 1818, in 1886 changed to 3040, and two years later, the engine was scrapped.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | White Raven |
| Locobase ID | 3501 |
| Railroad | St. Helens |
| Country | Great Britain |
| Whyte | 2-4-2T |
| Number in Class | 1 |
| Road Numbers | |
| Gauge | Std |
| Number Built | 1 |
| Builder | Cross & Co. |
| Year | 1863 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 8 / 2.44 |
| Engine Wheelbase (ft / m) | 22 / 6.71 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.36 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 26,320 / 11,939 |
| Weight on Drivers (lbs / kg) | 51,520 / 23,369 |
| Engine Weight (lbs / kg) | 91,280 / 41,404 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | 91,280 / 41,404 |
| Tender Water Capacity (gals / ML) | 950 / 3.60 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 1.40 / 1 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 43 / 21.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 61 / 1549 |
| Boiler Pressure (psi / kPa) | 140 / 970 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 15" x 20" / 381x508 |
| Tractive Effort (lbs / kg) | 8779 / 3982.09 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.87 |
| 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) | 16.25 |
| Evaporative Heating Surface (sq ft / m2) | 687 / 63.85 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 687 / 63.85 |
| Evaporative Heating Surface/Cylinder Volume | 167.95 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2275 |
| Same as above plus superheater percentage | 2275 |
| Same as above but substitute firebox area for grate area | |
| Power L1 | |
| Power MT | |