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.61-62. See also "Garratts in Asia" on Rob Dickinson's International Steam website at [
], 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 | |
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Class | Mahabir |
Locobase ID | 704 |
Railroad | Nepal Government Railway |
Country | Nepal |
Whyte | 2-6-2+2-6-2 |
Number in Class | 2 |
Road Numbers | 4, 6 |
Gauge | 2'6" |
Number Built | 2 |
Builder | Beyer, Peacock |
Year | 1932 |
Valve Gear | Walschaert |
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 Volume | 248.89 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 3185 |
Same as above plus superheater percentage | 3631 |
Same as above but substitute firebox area for grate area | 15,262 |
Power L1 | 6139 |
Power MT | 1196.44 |