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London & North Western No. 687
This locomotive was a passenger prototype with Francis Webb's system of three-cylinder compound divided drive. It was built in 1885 by the LNWR's Crewe works. The design was basically derived from the 4ft 6 in tanks, ...
| London & North Western No. 687Remove | |
|---|---|
| Variant | Standard |
| Built | 1885 |
| Manufacturers | Crewe |
| Wheel arrangement | 1AA1 t |
| Gauge | 1435 mm |
| Length | |
| Service mass | 51666 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | London & North Western No. 687 Standard Remove |
|---|---|
| Built | 1885 |
| Manufacturers | Crewe |
| Wheel arrangement | 2-2-2-2T (Webb Compound) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | London & North Western No. 687 Standard Remove |
|---|---|
| Wheelbase | 6.48 m |
| Service mass | 51.7 t |
| Adhesion mass | 31.6 t |
| Rigid wheelbase | 2.36 m |
| Axle load | 15.8 t |
| Water capacity | 6,587 l |
Boiler
| Property | London & North Western No. 687 Standard Remove |
|---|---|
| Grate area | 1.323 m² |
| Firebox surface | 7.882 m² |
| Tube heating surface | 84.464 m² |
| Evaporative heating surface | 92.346 m² |
| Total heating surface | 92.3 m² |
Power plant
| Property | London & North Western No. 687 Standard Remove |
|---|---|
| Driver diameter | 1,435 mm |
| Boiler pressure | 10.3 bar |
| Expansion type | compound |
| Cylinders | three, HP: 356 x 457 mm and LP: 660 x 610 mm |
Power
| Property | London & North Western No. 687 Standard Remove |
|---|---|
| Power source | steam |
| Estimated power | 280 kW (381 PS) |
| Starting effort | 43.6 kN |
| Starting effort simple | 52.4 kN |
Calculated values
| Property | London & North Western No. 687 Standard Remove |
|---|---|
| Factor of adhesion | 1 : 7.10 |
| Optimal speed | 39 km/h |
| Power-to-weight ratio | 5.4 kW/t |
| Heating Surface Equivalent | 131.8 m² |
| Cylinder volume/HSE | 1 : 1,705.55 |
| Adhesive weight/Total | 1 : 1.64 |
| Tractive force/Heating surface | 1 : 9.87 |
| Grate area/Heating surface | 1 : 69.80 |
| Firebox/Tube surface | 1 : 10.72 |
