Darjeeling Himalaya Beyer-Garratt Locomotives in India

Class Details by Steve Llanso of Sweat House Media

Class D (Locobase 684)

Data from Gavin Hamilton -- []; and A[rthur] E[dward] Durrant, Garratt Locomotives of the World (revised edition) (Newton Abbott, UK: David & Charles, 1981), p.47. See also The Locomotive, Volume XVII [17] (15 April 1911), p. 85. Works number was 5407 in 1910.

The LM report commented that the Garratt layout was "well adapted" to handle the Darjeeling profile. The sharp reverse curves would entail superelevation that often put the two power bogies on different planes. The report added that in addition to the 720 US gallons in the two end tanks, a underframe tank held another 200 US gallons.

According to Gavin Hamilton, this was not an entirely successful ocomotive. Durrant offered several speculations as to why. A key reason could have been some weak elements in the design Other factors could have included lack of sufficient traffic requiiring tis use as well as short sidings and weak couplers. Nevertheless, it operated on the DHR until 1953.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID684
RailroadDarjeeling Himalaya
Number in Class1
Road Numbers31
Number Built1
BuilderBeyer, Peacock
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m) 8.50 / 2.59
Engine Wheelbase (ft / m)24.50 / 7.47
Ratio of driving wheelbase to overall engine wheelbase 0.35
Overall Wheelbase (engine & tender) (ft / m)24.50 / 7.47
Axle Loading (Maximum Weight per Axle) (lbs / kg)16,576 / 7519
Weight on Drivers (lbs / kg)62,804 / 28,487
Engine Weight (lbs / kg)62,804 / 28,487
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)62,804 / 28,487
Tender Water Capacity (gals / ML)1020 / 3.86
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 1.10 / 1
Minimum weight of rail (calculated) (lb/yd / kg/m)26 / 13
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)26 / 660
Boiler Pressure (psi / kPa)160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)11" x 14" / 279x356 (4)
Tractive Effort (lbs / kg)17,722 / 8038.57
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.54
Heating Ability
Tubes (number - dia) (in / mm)195 - 1.625" / 41
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 7.25 / 2.21
Firebox Area (sq ft / m2)64 / 5.95
Grate Area (sq ft / m2)17.50 / 1.63
Evaporative Heating Surface (sq ft / m2)667 / 61.97
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)667 / 61.97
Evaporative Heating Surface/Cylinder Volume216.57
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2800
Same as above plus superheater percentage2800
Same as above but substitute firebox area for grate area10,240
Power L12222
Power MT312.00

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