Wellington & Manawatu 2-8-4 Locomotives in New_Zealand
Class Details by Steve Llanso of Sweat House Media
Class Jumbo / Wj (Locobase 2709)
Data from John Garner's New Zealand Railways Steam Locomotives ([
], last accessed 16 December 2009) and from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 26, p. 212. Works number was 23596 in January 1904.
Garner comments: "If ever a locomotive was well named it was Jumbo, the most powerful, most 'cussed' and discussed engine on the Manawatu Railway." A rare 2-8-4 tank engine from an American builder, this locomotive served the suburban passenger traffic around Wellington. It was largely used as a pusher and developed so much power that it could bend its own bar frame.
After the WMR's absorption into the NZGR in 1908, #466 operated until March 1928.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Jumbo / Wj |
| Locobase ID | 2709 |
| Railroad | Wellington & Manawatu |
| Country | New Zealand |
| Whyte | 2-8-4T |
| Number in Class | 1 |
| Road Numbers | 3 / 466 |
| Gauge | 3'6" |
| Number Built | 1 |
| Builder | Burnham, Williams & Co |
| Year | 1904 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 11.75 / 3.58 |
| Engine Wheelbase (ft / m) | 29.42 / 8.97 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.40 |
| Overall Wheelbase (engine & tender) (ft / m) | 29.50 / 8.99 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 22,050 / 10,002 |
| Weight on Drivers (lbs / kg) | 85,120 / 38,610 |
| Engine Weight (lbs / kg) | 120,064 / 54,460 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | 120,064 / 54,460 |
| Tender Water Capacity (gals / ML) | 1116 / 4.23 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 2.80 / 3 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 35 / 17.50 |
| 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) | 17" x 20" / 432x508 |
| Tractive Effort (lbs / kg) | 22,851 / 10365.05 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.73 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 188 - 1.75" / 44 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 11.58 / 3.53 |
| Firebox Area (sq ft / m2) | 94.70 / 8.80 |
| Grate Area (sq ft / m2) | 16.50 / 1.53 |
| Evaporative Heating Surface (sq ft / m2) | 1080 / 100.37 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1080 / 100.37 |
| Evaporative Heating Surface/Cylinder Volume | 205.55 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 3300 |
| Same as above plus superheater percentage | 3300 |
| Same as above but substitute firebox area for grate area | 18,940 |
| Power L1 | 4238 |
| Power MT | 439.06 |