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London & North Western Whale Precursor class
Since 1877, Francis Webb had the “Improved Precedent” built for the LNWR, but it still had to be run double headed for heavy express trains. So later George Whale developed the Precursor class, which was basically bas...
General
| Property | London & North Western Whale Precursor classRemove |
|---|---|
| Built | 1904-1907 |
| Manufacturers | Crewe |
| Wheel arrangement | 4-4-0 (American) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | London & North Western Whale Precursor classRemove |
|---|---|
| Wheelbase | 7.66 m |
| Rigid wheelbase | 3.05 m |
| Total wheelbase | 14.42 m |
| Service weight | 59.9 t |
| Adhesive weight | 38.6 t |
| Axle load | 19.3 t |
| Total weight | 91.4 t |
| Water capacity | 16,364 l |
| Fuel capacity | 6.4 t (coal) |
Boiler
| Property | London & North Western Whale Precursor classRemove |
|---|---|
| Grate area | 2.081 m² |
| Firebox surface | 14.985 m² |
| Tube heating surface | 171.75 m² |
| Evaporative heating surface | 186.735 m² |
| Total heating surface | 186.7 m² |
Power plant
| Property | London & North Western Whale Precursor classRemove |
|---|---|
| Driver diameter | 2,057 mm |
| Boiler pressure | 12.1 bar |
| Expansion type | simple expansion |
| Cylinders | two, 483 x 660 mm |
Power
| Property | London & North Western Whale Precursor classRemove |
|---|---|
| Power source | steam |
| Estimated power | 690 kW (938 PS) |
| Starting effort | 76.7 kN |
Calculated values
| Property | London & North Western Whale Precursor classRemove |
|---|---|
| Factor of adhesion | 1 : 4.94 |
| Optimal speed | 55 km/h |
| Power-to-weight ratio | 11.5 kW/t |
| Heating Surface Equivalent | 261.7 m² |
| Cylinder volume/HSE | 1 : 923.35 |
| Adhesive weight/Total | 1 : 1.55 |
| Tractive force/Heating surface | 1 : 8.58 |
| Grate area/Heating surface | 1 : 89.73 |
| Firebox/Tube surface | 1 : 11.46 |
