Darjeeling & Himalaya 4-6-2 Locomotives in India
Class Details by Steve Llanso of Sweat House Media
Class C (Locobase 20417)
Data from "Tender Locomotives for the Darjeeling Himalayan Ry," The Locomotive Magazine, Vol XXI [21] (15 January 1915), p. 3. See also "Darjeeling Himalayan Railway - An Overview" in the Indian Steam Pages at [
], last accessed 6 August 2018.
This pair of Pacifics was expressly ordered for the Limited service on the Siliguri- Kishanganj Branch. Fitted with boilers made of the "best Yorkshire iron plates", the engines had square-shouldered Belpaire fireboxes. Room for these and their ashpans was had by splaying the frames in the rear section.
Both were preserved for static display.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | C |
| Locobase ID | 20417 |
| Railroad | Darjeeling & Himalaya |
| Country | India |
| Whyte | 4-6-2 |
| Number in Class | 2 |
| Road Numbers | 37-38/807-808 |
| Gauge | 2' |
| Number Built | 2 |
| Builder | North British |
| Year | 1914 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 5.75 / 1.75 |
| Engine Wheelbase (ft / m) | 18.37 / 5.60 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.31 |
| Overall Wheelbase (engine & tender) (ft / m) | 36.21 / 11.04 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 45,696 / 20,727 |
| Engine Weight (lbs / kg) | 62,832 / 28,500 |
| Tender Loaded Weight (lbs / kg) | 34,720 / 15,749 |
| Total Engine and Tender Weight (lbs / kg) | 97,552 / 44,249 |
| Tender Water Capacity (gals / ML) | 1440 / 5.45 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 25 / 12.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 30 / 762 |
| Boiler Pressure (psi / kPa) | 160 / 1100 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 13.5" x 16" / 343x406 |
| Tractive Effort (lbs / kg) | 13,219 / 5996.04 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.46 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | 57 / 5.30 |
| Grate Area (sq ft / m2) | 16 / 1.49 |
| Evaporative Heating Surface (sq ft / m2) | 835 / 77.57 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 835 / 77.57 |
| Evaporative Heating Surface/Cylinder Volume | 315.01 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2560 |
| Same as above plus superheater percentage | 2560 |
| Same as above but substitute firebox area for grate area | 9120 |
| Power L1 | 3380 |
| Power MT | 489.21 |