War Department Beyer-Garratt Locomotives in Burma

Class Details by Steve Llanso of Sweat House Media

Class WD Light-Metre / GC (Locobase 5801)

Data from Gavin Hamilton's excellent compilation of Garratt data posted at [] (6 September 2005); and A[rthur] E[dward] Durrant, Garratt Locomotives of the World (revised edition) (Newton Abbott, UK: David & Charles, 1981), p.

BP # 7122-7135 for the Burma Railway. These Double Mikado Garratts shared their boiler and firebox designs with the War Department's light Double Consolidation Garratts. Water tankage and fuel bunkerage grew and that increased total engine weight. Hamilton's tables say that adhesion weight decreased, which doesn't seem likely in view of the location of the water tanks over one set of drivers.

Principal Dimensions by Steve Llanso of Middle Run Media

ClassWD Light-Metre / GC
Locobase ID5801
RailroadWar Department
Number in Class
Road Numbers
Number Built
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)23,520 / 10,669
Weight on Drivers (lbs / kg)186,928 / 84,789
Engine Weight (lbs / kg)263,984 / 119,741
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)263,984 / 119,741
Tender Water Capacity (gals / ML)4320 / 16.36
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 6.60 / 6
Minimum weight of rail (calculated) (lb/yd / kg/m)39 / 19.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)39 / 991
Boiler Pressure (psi / kPa)204.50 / 14.10
High Pressure Cylinders (dia x stroke) (in / mm)15.5" x 20" / 394x508 (4)
Tractive Effort (lbs / kg)42,832 / 19428.29
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.36
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)187 / 17.38
Grate Area (sq ft / m2)43.70 / 4.06
Evaporative Heating Surface (sq ft / m2)1742 / 161.90
Superheating Surface (sq ft / m2)313 / 29.09
Combined Heating Surface (sq ft / m2)2055 / 190.99
Evaporative Heating Surface/Cylinder Volume199.41
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation8937
Same as above plus superheater percentage10,277
Same as above but substitute firebox area for grate area43,978
Power L18360
Power MT788.78

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