London & South Western 2-2-2 Locomotives in Great_Britain

Class Details by Steve Llanso of Sweat House Media

Class Canute (Locobase 663)

Data from Ahrons (1927).

Joseph Beattie's Canute-class design was governed by a firebox of his invention that attempted to burn coal efficiently when the London and South Western switched from coke. Inside the chamber, the firebox was divided into several parts to swirl the gases and combust them more thoroughly. The rear carrying axle had outside bearings to provide clearance for the firebox. The front axle had a peculiar design of inside bearing and heavy spring and a weaker outside steadying spring suspended from the crosshead guide.

The belt line was straight; the splasher had two concentric rows of slots, the lower row having a curve to provide clearance for the crank. The thimble-shaped, polished-brass dome stood on the firebox. A slender feedwater heater of Beattie's design stood in front of the stack, heating water past the boiling point with exhaust steam and providing up to 20% fuel savings.

Ahrons comments that the very low percentage of engine weight on the drivers was the principal reason these engines were the last single-drivered locomotives on the London & South Western.

Class Tartar (Locobase 10317)

Data from "The History of the London & South Western Locomotives," The Locomotive Magazine, Vol VIII (9 May 1903), p. 326. Boiler pressure is an estimate.

Sextet of small tank engines built in a single batch in Manchester (works numbers 689-694) with a tall dome on the firebox, slotted splashers over the drivers, outside cylinders, inside frames -- typical 1850s design. Their names represented an eclectic mix: Tartar, Jupiter, Orion, Queen, Albert, and Phoenix -- they might have been a class of Royal Navy ships-of-the-line.

These were never updated and were scrapped between December 1871 and June 1874, most likely because of their small size.

Principal Dimensions by Steve Llanso of Middle Run Media

Locobase ID663 10317
RailroadLondon & South WesternLondon & South Western
CountryGreat BritainGreat Britain
Number in Class6
Road Numbers
Number Built6
BuilderNine ElmsSharp Brothers
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)14.75 / 4.50
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)30.5014.75 / 4.50
Axle Loading (Maximum Weight per Axle) (lbs / kg)24,080
Weight on Drivers (lbs / kg)21,168 / 9602
Engine Weight (lbs / kg)63,747 / 28,915
Tender Loaded Weight (lbs / kg)40,656
Total Engine and Tender Weight (lbs / kg)104,403 / 28,915
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)35 / 17.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)78 / 198172.50 / 1842
Boiler Pressure (psi / kPa)130100 / 6.90
High Pressure Cylinders (dia x stroke) (in / mm)15" x 21" / 381x53314.75" x 20" / 375x508
Tractive Effort (lbs / kg)6694 / 3036.355101 / 2313.78
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.16
Heating Ability
Tubes (number - dia) (in / mm)373 - 1.25" / 32141 - 1.875" / 48
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)6 / 1.83
Firebox Area (sq ft / m2)144 / 13.6672.90 / 6.78
Grate Area (sq ft / m2)16 / 1.49
Evaporative Heating Surface (sq ft / m2)769 / 71.47781 / 72.58
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)769 / 71.47781 / 72.58
Evaporative Heating Surface/Cylinder Volume179.04197.45
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2080
Same as above plus superheater percentage2080
Same as above but substitute firebox area for grate area18,7207290
Power L158593499
Power MT610.21

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