Wellington & Manawatu 2-8-2 Locomotives in New_Zealand
Class Details by Steve Llanso of Sweat House Media
Class Bc (Locobase 4968)
Data from [
] accessed in January 2002 and and from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 24, p. 122.
A Vauclain compound Mikado delivered to the WMR, this was produced in 1896 (works #19796) together with one of the compound Prairies. The advantages of a trailing axle are obvious when #17 is compared to the WMR's Consolidations. The boiler's heating surface increased by 42% while the grate area grew by 50%; the latter growth suggests that a lot of the heating surface increase was directly heated by the firebox.
This Mike was taken into the New Zealand Government Railways when the W&M was absorbed in 1908 as Class Bc, #463. Of the WMR's inheritance, however, #463 was one of the first to be withdrawn, leaving in March 1927.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Bc |
| Locobase ID | 4968 |
| Railroad | Wellington & Manawatu |
| Country | New Zealand |
| Whyte | 2-8-2 |
| Number in Class | 1 |
| Road Numbers | 17 |
| Gauge | 3'6" |
| Number Built | 1 |
| Builder | Burnham, Williams & Co |
| Year | 1901 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 11.75 / 3.58 |
| Engine Wheelbase (ft / m) | 24.17 / 7.37 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.49 |
| Overall Wheelbase (engine & tender) (ft / m) | 47.33 / 14.43 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 20,860 / 9462 |
| Weight on Drivers (lbs / kg) | 80,892 / 36,692 |
| Engine Weight (lbs / kg) | 101,528 / 46,052 |
| Tender Loaded Weight (lbs / kg) | 58,240 / 26,417 |
| Total Engine and Tender Weight (lbs / kg) | 159,768 / 72,469 |
| Tender Water Capacity (gals / ML) | 1992 / 7.55 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 4.40 / 4 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 34 / 17 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 43 / 1092 |
| Boiler Pressure (psi / kPa) | 200 / 1380 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 11.5" x 20" / 292x508 |
| Low Pressure Cylinders (dia x stroke) (in / mm) | 18" x 20" / 457x508 |
| Tractive Effort (lbs / kg) | 14,852 / 6736.76 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.45 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 169 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 16 / 4.88 |
| Firebox Area (sq ft / m2) | 80.40 / 7.47 |
| Grate Area (sq ft / m2) | 25 / 2.32 |
| Evaporative Heating Surface (sq ft / m2) | 1483 / 137.83 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1483 / 137.83 |
| Evaporative Heating Surface/Cylinder Volume | 616.79 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 5000 |
| Same as above plus superheater percentage | 5000 |
| Same as above but substitute firebox area for grate area | 16,080 |
| Power L1 | 4587 |
| Power MT | 500.05 |