West Yorkshire 0-6-0 Locomotives in Great_Britain

Class Details by Steve Llanso of Sweat House Media

Class 470 (Marquis) (Locobase 9662)

Data from [], Steamindex's summary of Great Northern locomotive practice. See also George Frederick Bird, The Locomotives of the Great Northern Railway 1847-1910 (London: Locomotive Publishing Company, 1910), p. 44-45.

Bird describes these as "remarkably 'pretty' little six-coupled tank engines ...", which does not properly prepare the modern viewer for his sketch of the pair. A low-slung locomotive had just a spectacle board on the footplate, an ornate steam dome with fluted sides and a safety valve placed over the gap between the first two driving axles, tall slightly flared stack, and long side tanks and a well tank in the rear.

The author explains that the design was "...generally typical of a considerable number

brought out at about the same time by the makers, several of which were employed on Welsh railways, while others went to large ironworks, collieries and similar establishments,

where their handiness and power would prove extremely desirable." So pretty is as pretty does. Five years later they were rebuilt as saddle-tankers.

Principal Dimensions by Steve Llanso of Sweat House Media

Class470 (Marquis)
Locobase ID9662
RailroadWest Yorkshire (GNR)
CountryGreat Britain
Number in Class2
Road Numbers470-471
Number Built2
BuilderManning Wardle
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)15.25 / 4.65
Engine Wheelbase (ft / m)15.25 / 4.65
Ratio of driving wheelbase to overall engine wheelbase1
Overall Wheelbase (engine & tender) (ft / m)15.25 / 4.65
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)60,480 / 27,433
Engine Weight (lbs / kg)60,480 / 27,433
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)60,480 / 27,433
Tender Water Capacity (gals / ML)1000 / 3.79
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)34 / 17
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)50 / 1270
Boiler Pressure (psi / kPa)160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)15" x 22" / 381x559
Tractive Effort (lbs / kg)13,464 / 6107.17
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.49
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)10.75 / 1
Evaporative Heating Surface (sq ft / m2)783 / 72.77
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)783 / 72.77
Evaporative Heating Surface/Cylinder Volume174.01
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1720
Same as above plus superheater percentage1720
Same as above but substitute firebox area for grate area
Power L1
Power MT

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