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London & North Eastern class W1 “Hush-Hush”
In 1929, Gresley attempted to build a high-pressure locomotive using the Yarrow boiler from shipbuilding. This boiler consisted of three barrels arranged in a delta shape and was not divided into a firebox and a boile...
| London & North Eastern class W1 “Hush-Hush”Remove | |
|---|---|
| Variant | |
| Built | 1936 |
| Manufacturers | Doncaster |
| Wheel arrangement | 2C2 |
| Gauge | 1435 mm |
| Length | |
| Service mass | 109733 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | London & North Eastern class W1 “Hush-Hush”Remove |
|---|---|
| Built | 1936 |
| Manufacturers | Doncaster |
| Wheel arrangement | 4-6-4 (Hudson) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | London & North Eastern class W1 “Hush-Hush”Remove |
|---|---|
| Service mass | 109.7 t |
| Adhesion mass | 67.1 t |
| Water capacity | 22,731 l |
| Fuel capacity | 9.1 t (coal) |
Boiler
| Property | London & North Eastern class W1 “Hush-Hush”Remove |
|---|---|
| Grate area | 4.645 m² |
| Firebox surface | 103.494 m² |
| Tube heating surface | 137.868 m² |
| Evaporative heating surface | 241.362 m² |
| Superheater surface | 69.677 m² |
| Total heating surface | 311.0 m² |
Power plant
| Property | London & North Eastern class W1 “Hush-Hush”Remove |
|---|---|
| Driver diameter | 2,032 mm |
| Boiler pressure | 17.2 bar |
| Expansion type | simple expansion |
| Cylinders | three, 508 x 660 mm |
Power
| Property | London & North Eastern class W1 “Hush-Hush”Remove |
|---|---|
| Power source | steam |
| Estimated power | 1,864 kW (2,534 PS) |
| Starting effort | 184.3 kN |
Calculated values
| Property | London & North Eastern class W1 “Hush-Hush”Remove |
|---|---|
| Factor of adhesion | 1 : 3.57 |
| Optimal speed | 61 km/h |
| Power-to-weight ratio | 17.0 kW/t |
| Heating Surface Equivalent | 898.2 m² |
| Cylinder volume/HSE | 1 : 447.07 |
| Adhesive weight/Total | 1 : 1.64 |
| Tractive force/Heating surface | 1 : 12.38 |
| Grate area/Heating surface | 1 : 66.96 |
| Firebox/Tube surface | 1 : 1.33 |
| Total/Superheater | 1 : 3.46 |
