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London & North Western Improved Precedent class
As its name suggests, the LNWR Improved Precedent or Renewed Precedent class was an upgraded variant of Webb's Precedent class. In reality, only eight were rebuilt from Precedent class locomotives, while 158 more were...
General
| Property | London & North Western Improved Precedent classRemove |
|---|---|
| Built | 1887-1901 |
| Manufacturers | Crewe |
| Wheel arrangement | 2-4-0 (Porter) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | London & North Western Improved Precedent classRemove |
|---|---|
| Wheelbase | 4.78 m |
| Rigid wheelbase | 4.78 m |
| Service weight | 33.3 t |
| Adhesive weight | 22.9 t |
| Axle load | 11.7 t |
| Total weight | 58.7 t |
| Water capacity | 8,184 l |
Boiler
| Property | London & North Western Improved Precedent classRemove |
|---|---|
| Grate area | 1.579 m² |
| Firebox surface | 9.615 m² |
| Tube heating surface | 91.092 m² |
| Evaporative heating surface | 100.707 m² |
| Total heating surface | 100.7 m² |
Power plant
| Property | London & North Western Improved Precedent classRemove |
|---|---|
| Driver diameter | 2,057 mm |
| Boiler pressure | 10.3 bar |
| Expansion type | simple expansion |
| Cylinders | two, 432 x 610 mm |
Power
| Property | London & North Western Improved Precedent classRemove |
|---|---|
| Power source | steam |
| Estimated power | 354 kW (481 PS) |
| Starting effort | 48.6 kN |
Calculated values
| Property | London & North Western Improved Precedent classRemove |
|---|---|
| Factor of adhesion | 1 : 4.62 |
| Optimal speed | 45 km/h |
| Power-to-weight ratio | 10.6 kW/t |
| Heating Surface Equivalent | 148.8 m² |
| Cylinder volume/HSE | 1 : 1,200.00 |
| Adhesive weight/Total | 1 : 1.46 |
| Tractive force/Heating surface | 1 : 10.07 |
| Grate area/Heating surface | 1 : 63.78 |
| Firebox/Tube surface | 1 : 9.47 |
