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New Zealand Railways class Q (1901)
The class Q of 1901 was most likely the first class of tender locomotives originally built as 4-6-2 “Pacifics”. It arose from the need for a locomotive like the 4-6-0 class U[h]B[/h], but with a wide firebox to burn t...
| New Zealand Railways class Q (1901)Remove | |
|---|---|
| Variant | Standard |
| Built | 1901 |
| Manufacturers | Baldwin |
| Wheel arrangement | 2C1 |
| Gauge | 1067 mm |
| Length | 16870 mm |
| Service mass | 48770 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | New Zealand Railways class Q (1901) Standard Remove |
|---|---|
| Built | 1901 |
| Manufacturers | Baldwin |
| Wheel arrangement | 4-6-2 (Pacific) |
| Gauge | 1,067 mm |
Dimensions and weights
| Property | New Zealand Railways class Q (1901) Standard Remove |
|---|---|
| Length | 16.87 m |
| Wheelbase | 8.00 m |
| Service mass | 48.8 t |
| Adhesion mass | 31.2 t |
| Total mass | 73.3 t |
| Rigid wheelbase | 2.79 m |
| Axle load | 10.7 t |
| Water capacity | 7,730 l |
| Fuel capacity | 5.1 t (coal) |
Boiler
| Property | New Zealand Railways class Q (1901) Standard Remove |
|---|---|
| Grate area | 3.716 m² |
| Firebox surface | 9.773 m² |
| Tube heating surface | 145.654 m² |
| Evaporative heating surface | 155.427 m² |
| Total heating surface | 155.4 m² |
Power plant
| Property | New Zealand Railways class Q (1901) Standard Remove |
|---|---|
| Driver diameter | 1,245 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | simple expansion |
| Cylinders | two, 406 x 559 mm |
Power
| Property | New Zealand Railways class Q (1901) Standard Remove |
|---|---|
| Power source | steam |
| Estimated power | 746 kW (1,014 PS) |
| Starting effort | 86.9 kN |
Calculated values
| Property | New Zealand Railways class Q (1901) Standard Remove |
|---|---|
| Factor of adhesion | 1 : 3.52 |
| Optimal speed | 53 km/h |
| Power-to-weight ratio | 15.3 kW/t |
| Heating Surface Equivalent | 204.3 m² |
| Cylinder volume/HSE | 1 : 709.63 |
| Adhesive weight/Total | 1 : 1.56 |
| Tractive force/Heating surface | 1 : 11.68 |
| Grate area/Heating surface | 1 : 41.83 |
| Firebox/Tube surface | 1 : 14.90 |
