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Queensland Railways class BB18¼
The BB18¼ was a light 4-6-2 “Pacific” for mixed traffic that was ordered by the Queensland Railways after World War II from Vulcan Foundry in England. While the B in the designation stood for three coupled axles and t...
| Queensland Railways class BB18¼Remove | |
|---|---|
| Variant | Standard |
| Built | 1950-1951, 1955-1958 |
| Manufacturers | Vulcan Foundry;Walkers |
| Wheel arrangement | 2C1 |
| Gauge | 1067 mm |
| Length | 18339 mm |
| Service mass | 58880 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Queensland Railways class BB18¼ Standard Remove |
|---|---|
| Built | 1950-1951, 1955-1958 |
| Manufacturers | Vulcan Foundry, Walkers |
| Wheel arrangement | 4-6-2 (Pacific) |
| Gauge | 1,067 mm |
Dimensions and weights
| Property | Queensland Railways class BB18¼ Standard Remove |
|---|---|
| Length | 18.34 m |
| Wheelbase | 8.28 m |
| Total wheelbase | 14.16 m |
| Service mass | 58.9 t |
| Adhesion mass | 36.4 t |
| Total mass | 102.8 t |
| Rigid wheelbase | 3.35 m |
| Axle load | 12.2 t |
| Water capacity | 15,910 l |
| Fuel capacity | 10.5 t (coal) |
Boiler
| Property | Queensland Railways class BB18¼ Standard Remove |
|---|---|
| Grate area | 2.323 m² |
| Firebox surface | 9.848 m² |
| Tube heating surface | 131.737 m² |
| Evaporative heating surface | 141.584 m² |
| Superheater surface | 31.03 m² |
| Total heating surface | 172.6 m² |
Power plant
| Property | Queensland Railways class BB18¼ Standard Remove |
|---|---|
| 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 BB18¼ Standard Remove |
|---|---|
| Power source | steam |
| Estimated power | 820 kW (1,115 PS) |
| Starting effort | 100.7 kN |
Calculated values
| Property | Queensland Railways class BB18¼ Standard Remove |
|---|---|
| Factor of adhesion | 1 : 3.55 |
| Optimal speed | 50 km/h |
| Power-to-weight ratio | 13.9 kW/t |
| Heating Surface Equivalent | 252.9 m² |
| Cylinder volume/HSE | 1 : 813.64 |
| Adhesive weight/Total | 1 : 1.62 |
| Tractive force/Heating surface | 1 : 12.19 |
| Grate area/Heating surface | 1 : 74.31 |
| Firebox/Tube surface | 1 : 13.38 |
| Total/Superheater | 1 : 4.56 |
