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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...
General
| Property | London & North Eastern Thompson class B1Remove |
|---|---|
| Built | 1942-1952 |
| Manufacturers | Darlington, Gorton, North British, Vulcan Foundry |
| Wheel arrangement | 4-6-0 (Ten-wheeler) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | London & North Eastern Thompson class B1Remove |
|---|---|
| Wheelbase | 8.53 m |
| Rigid wheelbase | 4.95 m |
| Total wheelbase | 15.61 m |
| Service weight | 72.4 t |
| Adhesive weight | 53.3 t |
| Axle load | 18 t |
| Total weight | 125.2 t |
| Water capacity | 19,094 l |
| Fuel capacity | 7.6 t (coal) |
Boiler
| Property | London & North Eastern Thompson class B1Remove |
|---|---|
| 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 B1Remove |
|---|---|
| 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 B1Remove |
|---|---|
| Power source | steam |
| Estimated power | 1,342 kW (1,825 PS) |
| Starting effort | 119.6 kN |
Calculated values
| Property | London & North Eastern Thompson class B1Remove |
|---|---|
| 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 |
