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New Zealand Railways class X
The class X was the first type of 4-8-2 tender locomotives newly built anywhere in the world. A.M. Beattie designed it for heavy freight traffic on the mountainous central section of the North Island Main Trunk Railwa...
| New Zealand Railways class XRemove | |
|---|---|
| Variant | superheated |
| Built | 1943-1949 |
| Manufacturers | Addington |
| Wheel arrangement | 2D1 |
| Gauge | 1067 mm |
| Length | 17316 mm |
| Service mass | 67669 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | New Zealand Railways class Xsuperheated |
|---|---|
| Built | 1943-1949 |
| Manufacturers | Addington |
| Wheel arrangement | 4-8-2 (Mountain) |
| Gauge | 1,067 mm |
Dimensions and weights
| Property | New Zealand Railways class Xsuperheated |
|---|---|
| Length | 17.32 m |
| Wheelbase | 8.71 m |
| Total wheelbase | 14.19 m |
| Service mass | 67.7 t |
| Adhesion mass | 46.3 t |
| Total mass | 96.7 t |
| Rigid wheelbase | 4.12 m |
| Water capacity | 10,001 l |
| Fuel capacity | 5.1 t (coal) |
Boiler
| Property | New Zealand Railways class Xsuperheated |
|---|---|
| Grate area | 3.484 m² |
| Firebox surface | 10.842 m² |
| Tube heating surface | 99.248 m² |
| Evaporative heating surface | 110.09 m² |
| Superheater surface | 15.608 m² |
| Total heating surface | 125.7 m² |
Power plant
| Property | New Zealand Railways class Xsuperheated |
|---|---|
| Driver diameter | 1,143 mm |
| Boiler pressure | 14.8 bar |
| Expansion type | simple expansion |
| Cylinders | four, 343 x 559 mm |
Power
| Property | New Zealand Railways class Xsuperheated |
|---|---|
| Power source | steam |
| Estimated power | 895 kW (1,217 PS) |
| Starting effort | 144.9 kN |
Calculated values
| Property | New Zealand Railways class Xsuperheated |
|---|---|
| Factor of adhesion | 1 : 3.14 |
| Optimal speed | 37 km/h |
| Power-to-weight ratio | 13.2 kW/t |
| Heating Surface Equivalent | 195.5 m² |
| Cylinder volume/HSE | 1 : 1,055.74 |
| Adhesive weight/Total | 1 : 1.46 |
| Tractive force/Heating surface | 1 : 24.07 |
| Grate area/Heating surface | 1 : 36.08 |
| Firebox/Tube surface | 1 : 9.15 |
| Total/Superheater | 1 : 7.05 |
