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 NZR, the last four of a group of twelve that included six delivered to the NZR 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short career, being scrapped in March 1927 (all but 352). 352 lingered more than two years longer before being withdrawn in August 1929.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 Middle Run 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 / 1380 |
| 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 |