Bolton & Leigh 0-4-0 Locomotives in Great_Britain

Class Details by Steve Llanso of Sweat House Media

Class Lancashire Witch (Locobase 633)

The first Stephenson engine with angled cylinders, which drove the leading axle directly, and thus a pathfinder toward the more efficient layout of cylinders and driving gear. Also fitted with a variable cut-off valve gear that actually worked in reverse, using an early cut-off when starting in order to save steam generated in the inadequate boiler. The boiler was a hybrid, intermediate step between a single flue and the later multi-tube having a central flue, 2 smaller return flues, and 2 water-tubes within the central flue.

Principal Dimensions by Steve Llanso of Sweat House Media

ClassLancashire Witch
Locobase ID633
RailroadBolton & Leigh
CountryGreat Britain
Number in Class1
Road Numbers
Number Built1
BuilderRobert Stephenson & Co
Valve Gear
Locomotive Length and Weight
Driver Wheelbase (ft / m)5 / 1.52
Engine Wheelbase (ft / m)5 / 1.52
Ratio of driving wheelbase to overall engine wheelbase1
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)15,435 / 7001
Engine Weight (lbs / kg)15,435 / 7001
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)13 / 6.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)48 / 1219
Boiler Pressure (psi / kPa)
High Pressure Cylinders (dia x stroke) (in / mm)9" x 24" / 229x610
Tractive Effort (lbs / kg)
Factor of Adhesion (Weight on Drivers/Tractive Effort)
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)12 / 1.12
Evaporative Heating Surface (sq ft / m2)66 / 6.13
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)66 / 6.13
Evaporative Heating Surface/Cylinder Volume37.35
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation
Same as above plus superheater percentage
Same as above but substitute firebox area for grate area
Power L1
Power MT

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Wes Barris