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New Zealand Railways class G
The only Garratt locomotives to ever operate in New Zealand were the three members of the class G delivered in 1928. They had been ordered due to rising train loads on the heavy grades on the North Island Main Trunk. ...
| New Zealand Railways class GRemove | |
|---|---|
| Variant | Standard |
| Built | 1928 |
| Manufacturers | Beyer, Peacock & Co. |
| Wheel arrangement | (2C1)(1C2) t ga |
| Gauge | 1067 mm |
| Length | 25698 mm |
| Service mass | 149156 kg |
| Top speed | 80 km/h |
| Power | |
| Engine |
General
| Property | New Zealand Railways class G Standard Remove |
|---|---|
| Built | 1928 |
| Manufacturers | Beyer, Peacock & Co. |
| Wheel arrangement | 4-6-2+2-6-4T (Double Pacific (Garratt)) |
| Gauge | 1,067 mm |
Dimensions and weights
| Property | New Zealand Railways class G Standard Remove |
|---|---|
| Length | 25.70 m |
| Service mass | 149.2 t |
| Adhesion mass | 88.8 t |
| Rigid wheelbase | 6.55 m |
| Axle load | 15.1 t |
| Water capacity | 15,142 l |
| Fuel capacity | 6.8 t (coal) |
Boiler
| Property | New Zealand Railways class G Standard Remove |
|---|---|
| Grate area | 5.407 m² |
| Firebox surface | 24.712 m² |
| Tube heating surface | 181.811 m² |
| Evaporative heating surface | 206.524 m² |
| Superheater surface | 50.353 m² |
| Total heating surface | 256.9 m² |
Power plant
| Property | New Zealand Railways class G Standard Remove |
|---|---|
| Driver diameter | 1,448 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | simple expansion |
| Cylinders | six, 419 x 610 mm |
Power
| Property | New Zealand Railways class G Standard Remove |
|---|---|
| Power source | steam |
| Estimated power | 1,342 kW (1,825 PS) |
| Top speed | 80 km/h |
| Starting effort | 260.1 kN |
Calculated values
| Property | New Zealand Railways class G Standard Remove |
|---|---|
| Factor of adhesion | 1 : 3.35 |
| Optimal speed | 32 km/h |
| Power-to-weight ratio | 9.0 kW/t |
| Heating Surface Equivalent | 430.8 m² |
| Cylinder volume/HSE | 1 : 1,171.27 |
| Adhesive weight/Total | 1 : 1.68 |
| Tractive force/Heating surface | 1 : 21.14 |
| Grate area/Heating surface | 1 : 47.51 |
| Firebox/Tube surface | 1 : 7.36 |
| Total/Superheater | 1 : 4.10 |
