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 Middle Run Media | |
---|---|
Class | 470 (Marquis) |
Locobase ID | 9662 |
Railroad | West Yorkshire (GNR) |
Country | Great Britain |
Whyte | 0-6-0T |
Number in Class | 2 |
Road Numbers | 470-471 |
Gauge | Std |
Number Built | 2 |
Builder | Manning Wardle |
Year | 1867 |
Valve Gear | Stephenson |
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 wheelbase | 1 |
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) | |
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 / 1100 |
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 Volume | 174.01 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 1720 |
Same as above plus superheater percentage | 1720 |
Same as above but substitute firebox area for grate area | |
Power L1 | |
Power MT |