Guest Keen & Baldwins Beyer-Garratt Locomotives in Great_Britain

Class Details by Steve Llanso of Sweat House Media

Class 12 (Locobase 500)

Data from compilation of Garratt data posted by Gavin Hamilton at [] (6 September 2005). See also Roger E. West's article on the William Francis originally published in The Industrial Railway Record (No 11 - September 1966) and archived online at [] 22 July 2004).Works number was 6779 in 1934..

This was one of three standard-gauge Garrtts produced for British industrial users to the same design as the first (Locobase 641). The owner was based in Cardiff and had only recently )improved its market position when predecessor Guest Keen and Nettlefolds acquired the rival Baldwins steel concern. They continued focusing on steel production into the 1950s and operated this Garratt until 1958.

Much later, the international conglomerate GKN could trace its roots to Guest Keen.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID500
RailroadGuest Keen & Baldwins
CountryGreat Britain
Number in Class1
Road Numbers12
Number Built1
BuilderBeyer, Peacock
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)36,960 / 16,765
Weight on Drivers (lbs / kg)137,760 / 62,487
Engine Weight (lbs / kg)137,760 / 62,487
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)137,760 / 62,487
Tender Water Capacity (gals / ML)1658 / 6.28
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 1.70 / 2
Minimum weight of rail (calculated) (lb/yd / kg/m)57 / 28.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)40 / 1016
Boiler Pressure (psi / kPa)185 / 12.80
High Pressure Cylinders (dia x stroke) (in / mm)14" x 20" / 356x508 (4)
Tractive Effort (lbs / kg)30,821 / 13980.19
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.47
Heating Ability
Tubes (number - dia) (in / mm)288 - 1.75" / 44
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 9.83 / 2.90
Firebox Area (sq ft / m2)107 / 9.94
Grate Area (sq ft / m2)22.70 / 2.11
Evaporative Heating Surface (sq ft / m2)1406 / 130.62
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1406 / 130.62
Evaporative Heating Surface/Cylinder Volume197.28
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4200
Same as above plus superheater percentage4200
Same as above but substitute firebox area for grate area19,795
Power L13359
Power MT215.02

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