Nepal Government Railway Beyer-Garratt Locomotives in Nepal


Class Details by Steve Llanso of Sweat House Media

Class Mahabir (Locobase 704)

Data from Gavin Hamilton's excellent compilation of Garratt data posted at [link] (6 September 2005); and A[rthur] E[dward] Durrant, Garratt Locomotives of the World (revised edition) (Newton Abbott, UK: David & Charles, 1981), p.61-62. See also "Garratts in Asia" on Rob Dickinson's International Steam website at [link], last accessed 14 March 2023. Works number was 6736 in 1932. Beyer also delivered #6 (works number 7243) of this class of Double Prairie Garratts in 1947.

Durrant sketched the challenging profile tackled by these two engines. The line rand Birgenj (sic) in India to Simra. At that point, further climbing to Amlekhganj entailed overcoming 1 in 30 (3.3%) grades.

Dickinson reported that after that line closed, the pair went to the Janakpur Railway. "Here", he wrote,"the terrain was flat and they saw little use" before the railway converted to diesels in 1994. Still, the pair was cared for and did seem some duty as Richard Pelham's 1981 photo of the 6 and Basil Roberts's 1992 image of the 4 indicate.

Principal Dimensions by Steve Llanso of Middle Run Media
ClassMahabir
Locobase ID704
RailroadNepal Government Railway
CountryNepal
Whyte2-6-2+2-6-2
Number in Class2
Road Numbers4, 6
Gauge2'6"
Number Built2
BuilderBeyer, Peacock
Year1932
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)11,200 / 5080
Weight on Drivers (lbs / kg)67,872 / 30,786
Engine Weight (lbs / kg)106,400 / 48,262
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)1560 / 5.91
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 3.30 / 3
Minimum weight of rail (calculated) (lb/yd / kg/m)19 / 9.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)28 / 711
Boiler Pressure (psi / kPa)175 / 1210
High Pressure Cylinders (dia x stroke) (in / mm)10" x 16" / 254x406 (4)
Tractive Effort (lbs / kg)17,000 / 7711.08
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.99
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)76.50 / 7.11
Grate Area (sq ft / m2)18.20 / 1.69
Evaporative Heating Surface (sq ft / m2)724 / 67.29
Superheating Surface (sq ft / m2)120 / 11.15
Combined Heating Surface (sq ft / m2)844 / 78.44
Evaporative Heating Surface/Cylinder Volume248.89
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3185
Same as above plus superheater percentage3631
Same as above but substitute firebox area for grate area15,262
Power L16139
Power MT1196.44

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