London & North Western 4-4-2 Locomotives in Great_Britain


Class Details by Steve Llanso of Sweat House Media

Class Precursor Tank / 3P (Locobase 2197)

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 [link], 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
ClassPrecursor Tank / 3P
Locobase ID2197
RailroadLondon & North Western
CountryGreat Britain
Whyte4-4-2T
Number in Class50
Road Numbers
GaugeStd
Number Built50
BuilderL&NW - Crewe
Year1906
Valve GearJoy
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 Volume235.58
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3920
Same as above plus superheater percentage3920
Same as above but substitute firebox area for grate area28,228
Power L17221
Power MT355.35

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