Compare locomotives
Add a locomotive
New Zealand Railways classes J, J[h]A[/h] and J[h]B[/h]
The NZR class J of 1939 was designed to pull both express and freight trains on branch lines, but also be fast enough for use on main lines. They had a 4-8-2 wheel arrangement and were built with partial streamlining,...
| New Zealand Railways classes J, J[h]A[/h] and J[h]B[/h]Remove | |
|---|---|
| Variant | |
| Built | 1939 |
| Manufacturers | North British |
| Wheel arrangement | 2D1 |
| Gauge | 1067 mm |
| Length | 20396 mm |
| Service mass | 69650 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | New Zealand Railways classes J, J[h]A[/h] and J[h]B[/h]Remove |
|---|---|
| Built | 1939 |
| Manufacturers | North British |
| Wheel arrangement | 4-8-2 (Mountain) |
| Gauge | 1,067 mm |
Dimensions and weights
| Property | New Zealand Railways classes J, J[h]A[/h] and J[h]B[/h]Remove |
|---|---|
| Length | 20.40 m |
| Wheelbase | 10.62 m |
| Service mass | 69.7 t |
| Adhesion mass | 45.2 t |
| Total mass | 110.6 t |
| Rigid wheelbase | 4.34 m |
| Axle load | 11.7 t |
| Water capacity | 18,185 l |
| Fuel capacity | 6.1 t (coal) |
Boiler
| Property | New Zealand Railways classes J, J[h]A[/h] and J[h]B[/h]Remove |
|---|---|
| Grate area | 3.623 m² |
| Evaporative heating surface | 136.521 m² |
| Superheater surface | 26.292 m² |
| Total heating surface | 162.8 m² |
Power plant
| Property | New Zealand Railways classes J, J[h]A[/h] and J[h]B[/h]Remove |
|---|---|
| Driver diameter | 1,372 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | simple expansion |
| Cylinders | two, 457 x 660 mm |
Power
| Property | New Zealand Railways classes J, J[h]A[/h] and J[h]B[/h]Remove |
|---|---|
| Power source | steam |
| Estimated power | 820 kW (1,115 PS) |
| Starting effort | 118.0 kN |
Calculated values
| Property | New Zealand Railways classes J, J[h]A[/h] and J[h]B[/h]Remove |
|---|---|
| Factor of adhesion | 1 : 3.76 |
| Optimal speed | 42 km/h |
| Power-to-weight ratio | 11.8 kW/t |
| Adhesive weight/Total | 1 : 1.54 |
| Tractive force/Heating surface | 1 : 15.13 |
| Grate area/Heating surface | 1 : 44.94 |
| Total/Superheater | 1 : 5.19 |
