Data from "Railway Notes - London & North Western Ry", The Locomotive Magazine, Vol XII (15 August 1906), p. 128. See also Steamindex's summary of the class at [], last accessed 24 June 2009.
Hefty George Whale inside-cylinder tank engine design for the London and North Western that added another axle under the Precursor boiler (Locobase 2191) and combined the tender in a rigid frame. They were designed to handle heavy traffic on branch lines. A curious defect of Whale's designs apparently was his placement of the leading sandbox. According to Steamindex, "...he leading sandbox is the type that was near-impossible to fill, inside and beneath the frames, behind the leading brake hanger. To make things easier, the filler opening was brought outside the frames to the right of the upper footstep."
The last engine was retired in 1940, possibly because the wheel arrangement wasn't satisfactory and the boilers needed replacement. Or, as Steamindex reports, "The 4-4-2Ts were rough, sluggish and difficult to fire." Or, more succinctly, "good riddance."
Principal Dimensions by Steve Llanso of Middle Run Media | |
---|---|
Class | Precursor Tank / 3P |
Locobase ID | 2197 |
Railroad | London & North Western |
Country | Great Britain |
Whyte | 4-4-2T |
Number in Class | 50 |
Road Numbers | |
Gauge | Std |
Number Built | 50 |
Builder | L&NW - Crewe |
Year | 1906 |
Valve Gear | Joy |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | 10 / 3.05 |
Engine Wheelbase (ft / m) | 32.60 / 9.94 |
Ratio of driving wheelbase to overall engine wheelbase | 0.31 |
Overall Wheelbase (engine & tender) (ft / m) | |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
Weight on Drivers (lbs / kg) | 89,600 / 40,642 |
Engine Weight (lbs / kg) | 168,000 / 76,204 |
Tender Loaded Weight (lbs / kg) | |
Total Engine and Tender Weight (lbs / kg) | 168,000 / 76,204 |
Tender Water Capacity (gals / ML) | 1700 / 6.44 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 75 / 37.50 |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 75 / 1905 |
Boiler Pressure (psi / kPa) | 175 / 1210 |
High Pressure Cylinders (dia x stroke) (in / mm) | 19" x 26" / 483x660 |
Tractive Effort (lbs / kg) | 18,616 / 8444.09 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.81 |
Heating Ability | |
Tubes (number - dia) (in / mm) | |
Flues (number - dia) (in / mm) | |
Flue/Tube length (ft / m) | 12.03 |
Firebox Area (sq ft / m2) | 161.30 / 14.87 |
Grate Area (sq ft / m2) | 22.40 / 2.08 |
Evaporative Heating Surface (sq ft / m2) | 2010 / 186.80 |
Superheating Surface (sq ft / m2) | |
Combined Heating Surface (sq ft / m2) | 2010 / 186.80 |
Evaporative Heating Surface/Cylinder Volume | 235.58 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 3920 |
Same as above plus superheater percentage | 3920 |
Same as above but substitute firebox area for grate area | 28,228 |
Power L1 | 7221 |
Power MT | 355.35 |