Compare locomotives
Add a locomotive
New Zealand Railways classes W[h]AB[/h] and W[h]S[/h]
![W[h]AB[/h] 786 in July 1926 at Hillside](/data/photos/NZR_WAB.jpg)
In 1917, two tank locomotives were built in the Addington workshops with boilers that were originally intended for class A[h]B[/h] Pacifics. These now had an additional trailing axle and many common parts with the Pac...
General
| Property | New Zealand Railways classes W[h]AB[/h] and W[h]S[/h]Remove |
|---|---|
| Built | 1917-1926 |
| Manufacturers | Addington, Hillside, A & G Price |
| Wheel arrangement | 4-6-4T (Hudson) |
| Gauge | 1,067 mm (Cape gauge) |
Dimensions and weights
| Property | New Zealand Railways classes W[h]AB[/h] and W[h]S[/h]Remove |
|---|---|
| Length | 13.56 m |
| Wheelbase | 10.08 m |
| Rigid wheelbase | 3.05 m |
| Service weight | 72.6 t |
| Adhesive weight | 42.7 t |
| Axle load | 14.2 t |
| Water capacity | 7,730 l |
| Fuel capacity | 3 t (coal) |
Boiler
| Property | New Zealand Railways classes W[h]AB[/h] and W[h]S[/h]Remove |
|---|---|
| Grate area | 3.066 m² |
| Firebox surface | 11.427 m² |
| Tube heating surface | 94.947 m² |
| Evaporative heating surface | 106.374 m² |
| Superheater surface | 25.734 m² |
| Total heating surface | 132.1 m² |
Power plant
| Property | New Zealand Railways classes W[h]AB[/h] and W[h]S[/h]Remove |
|---|---|
| Driver diameter | 1,372 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | simple expansion |
| Cylinders | two, 432 x 660 mm |
Power
| Property | New Zealand Railways classes W[h]AB[/h] and W[h]S[/h]Remove |
|---|---|
| Power source | steam |
| Indicated power | 746 kW (1,014 PS) |
| Top speed | 97 km/h |
| Starting effort | 105.2 kN |
Calculated values
| Property | New Zealand Railways classes W[h]AB[/h] and W[h]S[/h]Remove |
|---|---|
| Factor of adhesion | 1 : 3.98 |
| Optimal speed | 43 km/h |
| Power-to-weight ratio | 10.3 kW/t |
| Heating Surface Equivalent | 215.0 m² |
| Cylinder volume/HSE | 1 : 899.71 |
| Adhesive weight/Total | 1 : 1.70 |
| Tractive force/Heating surface | 1 : 16.64 |
| Grate area/Heating surface | 1 : 43.09 |
| Firebox/Tube surface | 1 : 8.31 |
| Total/Superheater | 1 : 4.13 |
