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Queensland Railways class B18¼
The B18¼ was a class of low-drivered Pacifics designed for mixed traffic. While the B in the designation stood for three driving axles , the number represented the cylinder diameter in inches. The stroke of the cylind...
General
| Property | Queensland Railways class B18¼Remove |
|---|---|
| Built | 1926-1947 |
| Manufacturers | North Ipswich, Walkers |
| Wheel arrangement | 4-6-2 (Pacific) |
| Gauge | 1,067 mm (Cape gauge) |
Dimensions and weights
| Property | Queensland Railways class B18¼Remove |
|---|---|
| Service weight | 57.2 t |
| Total weight | 94.7 t |
| Water capacity | 13,639 l |
| Fuel capacity | 8.1 t (coal) |
Boiler
| Property | Queensland Railways class B18¼Remove |
|---|---|
| Grate area | 2.323 m² |
| Firebox surface | 9.848 m² |
| Tube heating surface | 140.377 m² |
| Evaporative heating surface | 150.225 m² |
| Superheater surface | 31.587 m² |
| Total heating surface | 181.8 m² |
Power plant
| Property | Queensland Railways class B18¼Remove |
|---|---|
| Driver diameter | 1,295 mm |
| Boiler pressure | 11.7 bar |
| Expansion type | simple expansion |
| Cylinders | two, 464 x 610 mm |
Power
| Property | Queensland Railways class B18¼Remove |
|---|---|
| Power source | steam |
| Estimated power | 820 kW (1,115 PS) |
| Starting effort | 100.7 kN |
Calculated values
| Property | Queensland Railways class B18¼Remove |
|---|---|
| Optimal speed | 50 km/h |
| Power-to-weight ratio | 14.3 kW/t |
| Heating Surface Equivalent | 262.6 m² |
| Cylinder volume/HSE | 1 : 783.43 |
| Tractive force/Heating surface | 1 : 11.57 |
| Grate area/Heating surface | 1 : 78.27 |
| Firebox/Tube surface | 1 : 14.25 |
| Total/Superheater | 1 : 4.76 |
