New Zealand Government Railways 4-4-2 Locomotives in New_Zealand
Class Details by Steve Llanso of Sweat House Media
Class L rebuilds (Locobase 5176)
Data from John Garner's comprehensive site at [
] ... (October 2002)
When the New Zealand railways took delivery of 10 2-4-0Ts from Avonside in 1877, they were pleased enough with their performance. But by the 1890s the small amount of bunkerage was seen as enough reason to enlarge the design to take a bogie instead of the leading truck. Three 4-4-0Ts were converted at Newmarket as La class engines.
Still the bunkerage cramped operational styles, so a trailing axle was added to create the 4-4-2T seen here. Of the original 10, 3 were simply sold off to the PWD in 1901-1903 and the others all became Atlantic tanks. Three new engines were added in 1902-1903, bringing the class up to 10 locomotives. At that point, they were all redesignated L.
(Garner's figure for engine wheelbase repeats that of the 2-4-0T and cannot be correct.)
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | L rebuilds |
| Locobase ID | 5176 |
| Railroad | New Zealand Government Railways |
| Country | New Zealand |
| Whyte | 4-4-2T |
| Number in Class | 7 |
| Road Numbers | |
| Gauge | 3'6" |
| Number Built | 10 |
| Builder | NRGR |
| Year | 1895 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 7 / 2.13 |
| Engine Wheelbase (ft / m) | |
| Ratio of driving wheelbase to overall engine wheelbase | |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 38,080 / 17,273 |
| Engine Weight (lbs / kg) | 70,560 / 32,006 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | 70,560 / 32,006 |
| Tender Water Capacity (gals / ML) | |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 32 / 16 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 42.50 / 1080 |
| Boiler Pressure (psi / kPa) | 160 / 1100 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 12" x 18" / 305x457 |
| Tractive Effort (lbs / kg) | 8294 / 3762.10 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.59 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | |
| Grate Area (sq ft / m2) | 10.60 / 0.99 |
| Evaporative Heating Surface (sq ft / m2) | 587 / 54.55 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 587 / 54.55 |
| Evaporative Heating Surface/Cylinder Volume | 249.13 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1696 |
| Same as above plus superheater percentage | 1696 |
| Same as above but substitute firebox area for grate area | |
| Power L1 | |
| Power MT | |