Data from Baldwin Locomotive Works, Record of Recent Construction ((1903), No. 31, p. 23-24; and DeGolyer, Volume 24, p. 19. Works numbers were 19270-19273 in July 1901.
This was a small quartet of Prairies for the NZGR, the last four of a group of twelve that included six delivered to the NZGR in 1885 (Locobase 4959) and two to the Wellington & Manatau (Locobase 4965). Like the others, the 1901 engines had to negotiate curves of 7 1/2 chains (495 feet) radius and bogies had take siding curves of 5 chains (330 feet). This batch came with piston valves. They enjoyed only a relatively short career, being scrapped in March 1927 (all but 352). 352 lingered more than two years longer before being withdrawn in August 1929.
Principal Dimensions by Steve Llanso of Sweat House Media | |
|---|---|
| Class | N / 351 |
| Locobase ID | 10775 |
| Railroad | New Zealand Government |
| Country | New Zealand |
| Whyte | 2-6-2 |
| Number in Class | 4 |
| Road Numbers | 351-354 |
| Gauge | 3'6" |
| Number Built | 4 |
| Builder | Burnham, Williams & Co |
| Year | 1901 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 9.50 / 2.90 |
| Engine Wheelbase (ft / m) | 22.08 / 6.73 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.43 |
| Overall Wheelbase (engine & tender) (ft / m) | 40.96 / 12.48 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 50,310 / 22,820 |
| Engine Weight (lbs / kg) | 69,810 / 31,665 |
| Tender Loaded Weight (lbs / kg) | 40,190 / 18,230 |
| Total Engine and Tender Weight (lbs / kg) | 110,000 / 49,895 |
| Tender Water Capacity (gals / ML) | 2000 / 7.58 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 28 / 14 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 49 / 1245 |
| Boiler Pressure (psi / kPa) | 200 / 13.80 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 15" x 20" / 381x508 |
| Tractive Effort (lbs / kg) | 15,612 / 7081.49 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.22 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 164 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 9.42 / 2.87 |
| Firebox Area (sq ft / m2) | 82.20 / 7.64 |
| Grate Area (sq ft / m2) | 16.40 / 1.52 |
| Evaporative Heating Surface (sq ft / m2) | 884 / 82.16 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 884 / 82.16 |
| Evaporative Heating Surface/Cylinder Volume | 216.10 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 3280 |
| Same as above plus superheater percentage | 3280 |
| Same as above but substitute firebox area for grate area | 16,440 |
| Power L1 | 5171 |
| Power MT | 679.79 |