New Reynolton Anthracite Colliery 0-4-0 Locomotives in Great_Britain


Class Details by Steve Llanso of Sweat House Media

Class Bull Dog (Locobase 20508)

Data from "Tunnel Locomotive for the New Reynolton Colliery Co., Ltd", Locomotive Magazine, Volume XXI [21] (15 April 1915), p. 75. See also "Reynalton Colliery; New Reynolton Colliery, Reynalton" on the Coflein [Welsh cof (English "memory) and lein ("line") online database for the National Monuments Record of Wales (NMRW) at REYNALTON"[], last accessed 4 February 2019; "Saundersfoot Railway" on the Saundersfoot & District Historical Society website at [], last accessed 4 February 2019. Works number was 2401 in 1915.

LM's characterixation of this saddle-tank is "interesting", but Locobase finds it to be a fascinating example of making the most of quite restrictive requirements. (Two examples of American mine locomotives designed by Baldwin in the early 1870s (Locobases 10027-10028) have similar dimensions and power.) Engine height was limited to 6 ft (1.83 m) to pass through the Saundersfoot tunnel, which was bored in 1829.

The colliery was located at Begelly in Pembrokeshire. It was linked through the Saundersfoot Harbour and Railway Company's four-mile (6.4 km) line, which ran southeast to the port of Saundersfoot on the Bristol Channel near Tenby. Accordng to the , the Reynolton colliery opened as an anthracite drift mine in 1906, then rebuilt in 1914 by the NRAC, who bought the Bull Dog soon afterward. Fortune failed to smile, however, and the mine closed in 1921 with all but a few outbuildings cleared from the site.

The Bull Dog didn't go begging, however. It was transferred to the nearby Bonvilles Court Coal Company, where it worked until 1930 when that mine closed. It remained in a shed until 1934-1935, when it was run between Bonvilles Court and Broom Colliery until 1939. Bull Dog left the coal industry, transferring to serve the Llanelly steelworks in Llanelli, Carmathenshire, where it was regauged to standard gauge (1,435 mm). It was scrapped in 1951.

Principal Dimensions by Steve Llanso of Middle Run Media

ClassBull Dog
Locobase ID20508
RailroadNew Reynolton Anthracite Colliery
CountryGreat Britain
Whyte0-4-0ST
Number in Class1
Road Numbers
Gauge4'
Number Built1
BuilderKerr, Stuart & Co
Year1915
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 4.50 / 1.37
Engine Wheelbase (ft / m) 4.50 / 1.37
Ratio of driving wheelbase to overall engine wheelbase1
Overall Wheelbase (engine & tender) (ft / m) 4.50 / 1.37
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)26,880 / 12,193
Engine Weight (lbs / kg)26,880 / 12,193
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)26,880 / 12,193
Tender Water Capacity (gals / ML)300 / 1.14
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)22 / 11
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)30 / 762
Boiler Pressure (psi / kPa)160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)9" x 15" / 229x381
Tractive Effort (lbs / kg)5508 / 2498.39
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.88
Heating Ability
Tubes (number - dia) (in / mm)70 - 1.75" / 44
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 6.83 / 2.08
Firebox Area (sq ft / m2)30 / 2.79
Grate Area (sq ft / m2) 5.33 / 0.50
Evaporative Heating Surface (sq ft / m2)248 / 23.04
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)248 / 23.04
Evaporative Heating Surface/Cylinder Volume224.54
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation853
Same as above plus superheater percentage853
Same as above but substitute firebox area for grate area4800
Power L12883
Power MT472.91

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