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New Zealand Railways classes A and A[h]D[/h]
After the class Q had established the Pacific wheel arrangement for express service in New Zealand, the NZR ordered four-cylinder compound express locomotives. Since the Vauclain compound system was not liked by the N...
| New Zealand Railways classes A and A[h]D[/h]Remove | |
|---|---|
| Variant | A[h]D[/h] |
| Built | 1906-1914 |
| Manufacturers | Addington;A & G Price |
| Wheel arrangement | 2C1 |
| Gauge | 1067 mm |
| Length | 17424 mm |
| Service mass | 51818 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | New Zealand Railways classes A and A[h]D[/h] A[h]D[/h] Remove |
|---|---|
| Built | 1906-1914 |
| Manufacturers | Addington, A & G Price |
| Wheel arrangement | 4-6-2 (Pacific) |
| Gauge | 1,067 mm |
Dimensions and weights
| Property | New Zealand Railways classes A and A[h]D[/h] A[h]D[/h] Remove |
|---|---|
| Length | 17.42 m |
| Wheelbase | 8.26 m |
| Service mass | 51.8 t |
| Adhesion mass | 33.6 t |
| Total mass | 77.7 t |
| Rigid wheelbase | 3.05 m |
| Axle load | 11.4 t |
| Water capacity | 7,730 l |
| Fuel capacity | 4.1 t (coal) |
Boiler
| Property | New Zealand Railways classes A and A[h]D[/h] A[h]D[/h] Remove |
|---|---|
| Grate area | 2.787 m² |
| Firebox surface | 9.197 m² |
| Tube heating surface | 150.968 m² |
| Evaporative heating surface | 160.165 m² |
| Total heating surface | 160.2 m² |
Power plant
| Property | New Zealand Railways classes A and A[h]D[/h] A[h]D[/h] Remove |
|---|---|
| Driver diameter | 1,372 mm |
| Boiler pressure | 15.5 bar |
| Expansion type | compound |
| Cylinders | four, HP: 305 x 559 mm and LP: 483 x 559 mm |
Power
| Property | New Zealand Railways classes A and A[h]D[/h] A[h]D[/h] Remove |
|---|---|
| Power source | steam |
| Estimated power | 746 kW (1,014 PS) |
| Starting effort | 71.4 kN |
| Starting effort simple | 85.6 kN |
Calculated values
| Property | New Zealand Railways classes A and A[h]D[/h] A[h]D[/h] Remove |
|---|---|
| Factor of adhesion | 1 : 4.62 |
| Optimal speed | 64 km/h |
| Power-to-weight ratio | 14.4 kW/t |
| Heating Surface Equivalent | 206.2 m² |
| Cylinder volume/HSE | 1 : 891.41 |
| Adhesive weight/Total | 1 : 1.54 |
| Tractive force/Heating surface | 1 : 9.30 |
| Grate area/Heating surface | 1 : 57.47 |
| Firebox/Tube surface | 1 : 16.41 |
