Details of how this little saddle-tanker (works number 3518) ran on the D & H come from the unlikely site of the La Porte County Historical Steam Society ([]). Data supplemented by Baldwin's DeGolyer specification, Volume 60, pp. 333.
Data from Killingworth Hedges, "The Darjeeling Narrow-Gauge Mountain Railway," Industries (5 August 1887), p. 140.
This small well tank had a small saddle tank to take the water that was about to be admitted to the boiler. Hedges notes that an arrangement known as a "rudder coupling"--a curved plate on each of the cars that had links at each end--were designed to reduced slippage in the many curves: "The engines fitted with this coupling seldom slip when taking the curves, but, as a leading engineer described it, 'waltz round them' in a very easy manner. Some careful trials showed that an engine fitted with a rudder coupling and hauling ordinary stock would take some 23 per cent. more gross weight than a similar engine with an ordinary coupling and hauling Clemenson's radial axle cars." The locomotives pulled passenger carriages and freight waggons that had the same wheelbase as the engines.
Principal Dimensions by Steve Llanso of Sweat House Media | ||
---|---|---|
Class | B | unknown |
Locobase ID | 4798 | 14110 |
Railroad | Darjeeling & Himalayan | Darjeeling & Himalayan |
Country | India | India |
Whyte | 0-4-0ST | 0-4-0WT |
Number in Class | 30 | |
Road Numbers | 777-806 | |
Gauge | 2' | 2' |
Number Built | 30 | |
Builder | several | Sharp, Stewart |
Year | 1889 | 1887 |
Valve Gear | Walschaert | Stephenson |
Locomotive Length and Weight | ||
Driver Wheelbase (ft / m) | 5.50 / 1.68 | 4.19 / 1.28 |
Engine Wheelbase (ft / m) | 5.50 / 1.68 | 4.19 / 1.28 |
Ratio of driving wheelbase to overall engine wheelbase | 1 | 1 |
Overall Wheelbase (engine & tender) (ft / m) | 5.50 / 1.68 | 4.19 / 1.28 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | ||
Weight on Drivers (lbs / kg) | 34,360 / 15,585 | 24,640 / 11,177 |
Engine Weight (lbs / kg) | 34,360 / 15,585 | 24,640 / 11,177 |
Tender Loaded Weight (lbs / kg) | ||
Total Engine and Tender Weight (lbs / kg) | 34,360 / 15,585 | 24,640 / 11,177 |
Tender Water Capacity (gals / ML) | 456 / 1.73 | 390 / 1.48 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 0.80 / 1 | |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 29 / 14.50 | 21 / 10.50 |
Geometry Relating to Tractive Effort | ||
Driver Diameter (in / mm) | 26 / 660 | 25.25 / 641 |
Boiler Pressure (psi / kPa) | 140 / 9.70 | 140 / 9.70 |
High Pressure Cylinders (dia x stroke) (in / mm) | 11" x 14" / 279x356 | 10" x 14" / 254x356 |
Tractive Effort (lbs / kg) | 7753 / 3516.71 | 6598 / 2992.81 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.43 | 3.73 |
Heating Ability | ||
Tubes (number - dia) (in / mm) | 65 - 1.625" / 41 | |
Flues (number - dia) (in / mm) | ||
Flue/Tube length (ft / m) | 10.10 / 3.08 | |
Firebox Area (sq ft / m2) | 40 / 3.72 | 36 / 3.34 |
Grate Area (sq ft / m2) | 8.90 / 0.83 | |
Evaporative Heating Surface (sq ft / m2) | 316 / 29.36 | 264 / 24.53 |
Superheating Surface (sq ft / m2) | ||
Combined Heating Surface (sq ft / m2) | 316 / 29.36 | 264 / 24.53 |
Evaporative Heating Surface/Cylinder Volume | 205.21 | 207.44 |
Computations Relating to Power Output (More Information) | ||
Robert LeMassena's Power Computation | 1246 | |
Same as above plus superheater percentage | 1246 | |
Same as above but substitute firebox area for grate area | 5600 | 5040 |
Power L1 | 2033 | 2055 |
Power MT | 260.88 | 367.73 |