Burry Port & Gwendraeth Valley Articulated Locomotives in Great_Britain


Class Details by Steve Llanso of Sweat House Media

Class Pioneer/Mountaineer (Locobase 20247)

Data from "Fairlie's Engines for Sweden", Engineering, Volume 8 (24 December 1869), p 423. See also the George England, Robert Fairlie, and Hatcham Iron Works site at [link], last accessed 9 August 2017. (Thanks to Alexander Blessing for his 24 December 2021 email correcting the Mountaineer's valve gear.)

A pair of the double Fairlie design, which had two boilers and engine bogies under a frame with two fireboxes back to back that fed both boilers, was originally intended to run on the Nassjo & Oscarshamm Railway in Sweden, but neither ever did.

This engine was instead sold to South Wales railway BP&GV.

Principal Dimensions by Steve Llanso of Middle Run Media
ClassPioneer/Mountaineer
Locobase ID20247
RailroadBurry Port & Gwendraeth Valley
CountryGreat Britain
Whyte0-4-4-0T
Number in Class2
Road Numbers
GaugeStd
Number Built2
BuilderFairlie Engine & Steam Carriage Co
Year1869
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)5 / 1.52
Engine Wheelbase (ft / m)19.50 / 5.94
Ratio of driving wheelbase to overall engine wheelbase 0.26
Overall Wheelbase (engine & tender) (ft / m)19.50 / 5.94
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)56,000 / 25,401
Engine Weight (lbs / kg)56,000 / 25,401
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)840 / 3.18
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 0.84 / 1
Minimum weight of rail (calculated) (lb/yd / kg/m)23 / 11.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)42 / 1067
Boiler Pressure (psi / kPa)160 / 1100
High Pressure Cylinders (dia x stroke) (in / mm)10" x 18" / 254x457 (4)
Tractive Effort (lbs / kg)11,657 / 5287.53
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.80
Heating Ability
Tubes (number - dia) (in / mm)218 - 1.5" / 38
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 8.87 / 2.70
Firebox Area (sq ft / m2)70 / 6.50
Grate Area (sq ft / m2)11 / 1.02
Evaporative Heating Surface (sq ft / m2)833 / 77.39
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)833 / 77.39
Evaporative Heating Surface/Cylinder Volume254.55
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1760
Same as above plus superheater percentage1760
Same as above but substitute firebox area for grate area11,200
Power L14049
Power MT637.61

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