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London & North Western Precursor Tank class
By adding a trailing axle and reducing the driving wheel diameter by six inches, George Whale developed the Precursor tank class from the Precursor class tender locomotive . It was intended to pull heavy passenger tra...
General
| Property | London & North Western Precursor Tank classRemove |
|---|---|
| Built | 1906-1909 |
| Manufacturers | Crewe |
| Wheel arrangement | 4-4-2T (Atlantic) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | London & North Western Precursor Tank classRemove |
|---|---|
| Wheelbase | 9.94 m |
| Rigid wheelbase | 3.05 m |
| Service weight | 76.2 t |
| Adhesive weight | 40.6 t |
| Axle load | 20.3 t |
| Water capacity | 7,730 l |
Boiler
| Property | London & North Western Precursor Tank classRemove |
|---|---|
| Grate area | 2.081 m² |
| Firebox surface | 14.985 m² |
| Tube heating surface | 171.722 m² |
| Evaporative heating surface | 186.707 m² |
| Total heating surface | 186.7 m² |
Power plant
| Property | London & North Western Precursor Tank classRemove |
|---|---|
| Driver diameter | 1,905 mm |
| Boiler pressure | 12.1 bar |
| Expansion type | simple expansion |
| Cylinders | two, 483 x 660 mm |
Power
| Property | London & North Western Precursor Tank classRemove |
|---|---|
| Power source | steam |
| Estimated power | 671 kW (912 PS) |
| Starting effort | 82.8 kN |
Calculated values
| Property | London & North Western Precursor Tank classRemove |
|---|---|
| Factor of adhesion | 1 : 4.81 |
| Optimal speed | 50 km/h |
| Power-to-weight ratio | 8.8 kW/t |
| Heating Surface Equivalent | 261.6 m² |
| Cylinder volume/HSE | 1 : 923.44 |
| Adhesive weight/Total | 1 : 1.88 |
| Tractive force/Heating surface | 1 : 9.26 |
| Grate area/Heating surface | 1 : 89.72 |
| Firebox/Tube surface | 1 : 11.46 |
