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New Zealand Railways classes B, B[h]A[/h] and B[h]B[/h]
The class B was a 4-8-0 freight locomotive designed for the main lines of the South Island. Starting in 1899, four were delivered by Sharp, Stewart & Co. and six more by the NZR Addington shops. They were capable of h...
General
| Property | New Zealand Railways classes B, B[h]A[/h] and B[h]B[/h] Remove |
|---|---|
| Built | 1911-1913 |
| Manufacturers | Addington |
| Wheel arrangement | 4-8-0 (Twelve-wheeler) |
| Gauge | 1,067 mm (Cape gauge) |
Dimensions and weights
| Property | New Zealand Railways classes B, B[h]A[/h] and B[h]B[/h] Remove |
|---|---|
| Length | 15.93 m |
| Wheelbase | 6.92 m |
| Rigid wheelbase | 3.76 m |
| Total wheelbase | 13.67 m |
| Service weight | 44.6 t |
| Adhesive weight | 32.8 t |
| Axle load | 8.2 t |
| Total weight | 70.5 t |
| Water capacity | 7,730 l |
| Fuel capacity | 4.1 t (coal) |
Boiler
| Property | New Zealand Railways classes B, B[h]A[/h] and B[h]B[/h] Remove |
|---|---|
| Grate area | 1.551 m² |
| Firebox surface | 9.383 m² |
| Tube heating surface | 63.824 m² |
| Evaporative heating surface | 73.208 m² |
| Superheater surface | 19.138 m² |
| Total heating surface | 92.3 m² |
Power plant
| Property | New Zealand Railways classes B, B[h]A[/h] and B[h]B[/h] Remove |
|---|---|
| Driver diameter | 1,082 mm |
| Boiler pressure | 12.1 bar |
| Expansion type | simple expansion |
| Cylinders | two, 406 x 559 mm |
Power
| Property | New Zealand Railways classes B, B[h]A[/h] and B[h]B[/h] Remove |
|---|---|
| Power source | steam |
| Estimated power | 559 kW (760 PS) |
| Top speed | 48 km/h |
| Starting effort | 87.5 kN |
Calculated values
| Property | New Zealand Railways classes B, B[h]A[/h] and B[h]B[/h] Remove |
|---|---|
| Factor of adhesion | 1 : 3.68 |
| Optimal speed | 39 km/h |
| Power-to-weight ratio | 12.5 kW/t |
| Heating Surface Equivalent | 158.4 m² |
| Cylinder volume/HSE | 1 : 915.24 |
| Adhesive weight/Total | 1 : 1.36 |
| Tractive force/Heating surface | 1 : 19.78 |
| Grate area/Heating surface | 1 : 59.54 |
| Firebox/Tube surface | 1 : 6.80 |
| Total/Superheater | 1 : 3.83 |
