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London & North Eastern Thompson class B1
In World War II, Edward Thompson designed a new mixed-traffic 4-6-0 for the LNER that was to be called class B1. Due to wartime restrictions, its production costs had to be as low as possible thanks to the use of comp...
| London & North Eastern Thompson class B1Remove | |
|---|---|
| Variant | Standard |
| Built | 1942-1952 |
| Manufacturers | Darlington;Gorton;North British;Vulcan Foundry |
| Wheel arrangement | 2C |
| Gauge | 1435 mm |
| Length | |
| Service mass | 72393 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | London & North Eastern Thompson class B1 Standard Remove |
|---|---|
| Built | 1942-1952 |
| Manufacturers | Darlington, Gorton, North British, Vulcan Foundry |
| Wheel arrangement | 4-6-0 (Ten-wheeler) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | London & North Eastern Thompson class B1 Standard Remove |
|---|---|
| Wheelbase | 8.53 m |
| Total wheelbase | 15.61 m |
| Service mass | 72.4 t |
| Adhesion mass | 53.3 t |
| Total mass | 125.2 t |
| Rigid wheelbase | 4.95 m |
| Axle load | 18 t |
| Water capacity | 19,094 l |
| Fuel capacity | 7.6 t (coal) |
Boiler
| Property | London & North Eastern Thompson class B1 Standard Remove |
|---|---|
| Grate area | 2.592 m² |
| Firebox surface | 15.608 m² |
| Tube heating surface | 138.704 m² |
| Evaporative heating surface | 154.312 m² |
| Superheater surface | 31.959 m² |
| Total heating surface | 186.3 m² |
Power plant
| Property | London & North Eastern Thompson class B1 Standard Remove |
|---|---|
| Driver diameter | 1,880 mm |
| Boiler pressure | 15.5 bar |
| Expansion type | simple expansion |
| Cylinders | two, 508 x 660 mm |
Power
| Property | London & North Eastern Thompson class B1 Standard Remove |
|---|---|
| Power source | steam |
| Estimated power | 1,342 kW (1,825 PS) |
| Starting effort | 119.6 kN |
Calculated values
| Property | London & North Eastern Thompson class B1 Standard Remove |
|---|---|
| Factor of adhesion | 1 : 4.38 |
| Optimal speed | 69 km/h |
| Power-to-weight ratio | 18.5 kW/t |
| Heating Surface Equivalent | 296.3 m² |
| Cylinder volume/HSE | 1 : 903.58 |
| Adhesive weight/Total | 1 : 1.36 |
| Tractive force/Heating surface | 1 : 13.41 |
| Grate area/Heating surface | 1 : 71.86 |
| Firebox/Tube surface | 1 : 8.89 |
| Total/Superheater | 1 : 4.83 |
