London & North Western 0-4-2 Locomotives in Great_Britain

Class Details by Steve Llanso of Sweat House Media

Class Dock tank (Locobase 2184)

Data from [] (9 May 2003 -- the website of the London & North Western Railway Society's Goods Locomotives "exhibit" and from "Four-Coupled Shunting Engine, L & NW Ry," The Locomotive Magazine, Vol V (February 1900), p.24 and W A Tuplin, The Steam Locomotive: Its Form and Function (New York: Charles Scribner's Sons, 1974),

Francis W Webb wanted a yard engine that could negotiate quite tight curves without derailing, so he placed a trailing axle in a "carriage"(known to most as a Bissell truck) at the end of an arm that pivoted on a point just behind the rear driving set. "[I]t will readily be seen," said the grammatically precise LM author," that with this pivot as a center the carriage is free to move laterally and accommodate itself to the road." Indeed, a conical roller and two inclined planes under the carriage meant that the axle also was self-centering. This trailing-truck design earned the class the nickname "Bissell tanks".

Locobase wants to describe the tank as a "pannier tank", but realizes that the square cross-section of the tank does in fact lie on the boiler (rather than flanking it). The whole locomotive looks as if it had been carved out of a block of wood. The class suited its requirement quite well and some operated until 1967.

Principal Dimensions by Steve Llanso of Sweat House Media

ClassDock tank
Locobase ID2184
RailroadLondon & North Western
CountryGreat Britain
Number in Class20
Road Numbers
Number Built20
BuilderL&NW - Crewe
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 7.25 / 2.21
Engine Wheelbase (ft / m)15.50 / 4.72
Ratio of driving wheelbase to overall engine wheelbase 0.47
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)58,240 / 26,417
Engine Weight (lbs / kg)78,400 / 35,562
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)78,400 / 35,562
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)49 / 24.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)53 / 1346
Boiler Pressure (psi / kPa)150 / 10.30
High Pressure Cylinders (dia x stroke) (in / mm)17" x 24" / 432x610
Tractive Effort (lbs / kg)16,686 / 7568.65
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.49
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)85 / 7.90
Grate Area (sq ft / m2)15 / 1.39
Evaporative Heating Surface (sq ft / m2)967 / 89.87
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)967 / 89.87
Evaporative Heating Surface/Cylinder Volume153.37
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2250
Same as above plus superheater percentage2250
Same as above but substitute firebox area for grate area12,750
Power L12925
Power MT221.45

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Wes Barris