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New Zealand Railways class A[h]B[/h]
The NZR class A[h]B[/h] was a class of 141 superheated two-cylinder Pacifics. Its origins can be traced back to the class A of 1906 that was a saturated four-cylinder compound . No. 409 of this class was built as a si...
| New Zealand Railways class A[h]B[/h]Remove | |
|---|---|
| Variant | Standard |
| Built | 1915-1927 |
| Manufacturers | Addington;North British;A & G Price |
| Wheel arrangement | 2C1 |
| Gauge | 1067 mm |
| Length | 19025 mm |
| Service mass | 52123 kg |
| Top speed | 97 km/h |
| Power | |
| Engine |
General
| Property | New Zealand Railways class A[h]B[/h] Standard Remove |
|---|---|
| Built | 1915-1927 |
| Manufacturers | Addington, North British, A & G Price |
| Wheel arrangement | 4-6-2 (Pacific) |
| Gauge | 1,067 mm |
Dimensions and weights
| Property | New Zealand Railways class A[h]B[/h] Standard Remove |
|---|---|
| Length | 19.03 m |
| Wheelbase | 8.26 m |
| Total wheelbase | 16.00 m |
| Service mass | 52.1 t |
| Adhesion mass | 30.4 t |
| Total mass | 86.1 t |
| Rigid wheelbase | 3.05 m |
| Axle load | 11.5 t |
| Water capacity | 15,910 l |
| Fuel capacity | 4.1 t (coal) |
Boiler
| Property | New Zealand Railways class A[h]B[/h] Standard Remove |
|---|---|
| Grate area | 3.066 m² |
| Firebox surface | 10.684 m² |
| Tube heating surface | 95.969 m² |
| Evaporative heating surface | 106.653 m² |
| Superheater surface | 18.952 m² |
| Total heating surface | 125.6 m² |
Power plant
| Property | New Zealand Railways class A[h]B[/h] Standard Remove |
|---|---|
| Driver diameter | 1,372 mm |
| Boiler pressure | 12.4 bar |
| Expansion type | simple expansion |
| Cylinders | two, 432 x 660 mm |
Power
| Property | New Zealand Railways class A[h]B[/h] Standard Remove |
|---|---|
| Power source | steam |
| Estimated power | 820 kW (1,115 PS) |
| Top speed | 97 km/h |
| Starting effort | 94.7 kN |
Calculated values
| Property | New Zealand Railways class A[h]B[/h] Standard Remove |
|---|---|
| Factor of adhesion | 1 : 3.15 |
| Optimal speed | 53 km/h |
| Power-to-weight ratio | 15.7 kW/t |
| Heating Surface Equivalent | 198.0 m² |
| Cylinder volume/HSE | 1 : 976.96 |
| Adhesive weight/Total | 1 : 1.72 |
| Tractive force/Heating surface | 1 : 15.75 |
| Grate area/Heating surface | 1 : 40.97 |
| Firebox/Tube surface | 1 : 8.98 |
| Total/Superheater | 1 : 5.63 |
