Baddesley Colliery, Atherstone Beyer-Garratt Locomotives in Great_Britain

Class Details by Steve Llanso of Sweat House Media

Class William Francis (Locobase 640)

Works number was 6841 in 1937.

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).

This was one of three standard-gauge Garrtts produced for British industrial users to the same design as the first (Locobase 641). West notes that this Warwickshire colliery had built a link to the Midland Railway in the 1880s. It was a steeply graded line with sections pitched at better than 2% for most of the way. Toward the colliery end, the gradinet was 1 in 30 (better than 3%) and ultimately 1 in 23.

Baddesley used several non-articulated locomotives before they purchased this single Garratt in 1937. West says that it was virtually identical to the other three industrial Garratts then working in Britain (Locobase 500, 502, 641), "but suffered the economy of steel boiler bands and dome cover instead of brass ones on the earlier ones." Like the others, the William Francis used a Belpaire firebox.

The steep grade meant that the locomotive pushed the mineral wagons ahead of it going up and ran ahead of them coming down. Maximum load coming down was 18 standard 16-ton wagons. In later years, leaking steam required a lookout be posted on the smokebox.

By 1966, the William Francis was worn out and had been bought by Canadian enthusiasts.

Principal Dimensions by Steve Llanso of Middle Run Media

ClassWilliam Francis
Locobase ID640
RailroadBaddesley Colliery, Atherstone
CountryGreat Britain
Number in Class1
Road Numbers
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)1656 / 6.27
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)188.50 / 13
High Pressure Cylinders (dia x stroke) (in / mm)14" x 20" / 356x508 (4)
Tractive Effort (lbs / kg)31,404 / 14244.63
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.39
Heating Ability
Tubes (number - dia) (in / mm)288 - 1.75" / 44
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 9.83
Firebox Area (sq ft / m2)107 / 9.94
Grate Area (sq ft / m2)22.70 / 2.11
Evaporative Heating Surface (sq ft / m2)1406 / 130.67
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1406 / 130.67
Evaporative Heating Surface/Cylinder Volume197.28
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4279
Same as above plus superheater percentage4279
Same as above but substitute firebox area for grate area20,170
Power L13423
Power MT219.12

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Wes Barris