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The reference for locomotives and railcars

London & North Western Greater Britain class

Great Britain 1891 10 produced
No. 3436 “Queen Empress” PD

The Greater Britain class of the London & North Western Railway consisted of ten 2-2-2-2 Webb compounds built in Crewe between 1892 and 1894. Like Francis William Webb's other 2-2-2-0 compounds, the two driving axles were not coupled. They had wheels with a diameter of 6 ft 10 inches or 2,083 mm.

Two high pressure cylinders on the outside drove the trailing driving axle, while the large single low pressure cylinder on the inside drove the leading one. Due to the combination with two high pressure and only one low pressure cylinder, they had diameters of 15 and 30 inches, respectively. The leading axle had a radially adjustable bearing, while the trailing one had half an inch of side play. Since Webb's successor George Whale preferred simple superheated locomotives, all were scrapped in 1906 and 1907.

Technical data

General

Built
1891-1894
Manufacturers
Crewe
Wheel arrangement
2-2-2-2T (Webb Compound)
Gauge
1,435 mm (Standard gauge)

Dimensions and weights

Length
16.46 m
Wheelbase
7.29 m
Total wheelbase
13.39 m
Service mass
52.8 t
Adhesion mass
31.5 t
Total mass
78.2 t
Rigid wheelbase
2.52 m
Axle load
15.7 t
Water capacity
9,093 l
Fuel capacity
4.1 t (coal)

Boiler

Grate area
1.905 m²
Firebox surface
14.837 m²
Tube heating surface
125.048 m²
Evaporative heating surface
139.884 m²
Total heating surface
139.9 m²

Power plant

Driver diameter
2,159 mm
Boiler pressure
11.9 bar
Expansion type
compound
Cylinders
three, HP: 381 x 610 mm and LP: 762 x 610 mm

Power

Power source
steam
Estimated power
597 kW (812 PS)
Starting effort
49.9 kN
Starting effort simple
59.8 kN

Calculated values

Factor of adhesion
1 : 6.20
Optimal speed
72 km/h
Power-to-weight ratio
11.3 kW/t
Heating Surface Equivalent
214.1 m²
Cylinder volume/HSE
1 : 1,460.97
Adhesive weight/Total
1 : 1.68
Tractive force/Heating surface
1 : 7.45
Grate area/Heating surface
1 : 73.43
Firebox/Tube surface
1 : 8.43
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