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London & North Western Alfred the Great class
later Benbow class
Great Britain | 1901 | 40 produced

Webb developed the Alfred the Great class as an enlarged development of the Jubilee class. Like these, it had a four-cylinder compound engine. A redesign of the valve gear made them the Benbow class. After the Jubilees had been converted into two-cylinder simples, the same thing happened to 25 of the 40 Benbows from 1913 onwards. These, like the rebuilt Jubilees, came to the Renown class. 39 locomotives came to the LMS, the rest were retired by 1923.

General
Built1901-1903
ManufacturerCrewe
Axle config4-4-0 (American) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Service weight129,920 lbs
Adhesive weight82,880 lbs
Total weight189,504 lbs
Axle load41,440 lbs
Water capacity2,402 us gal
Fuel capacitycoal
Power
Power sourcesteam
Estimated power875 hp (652 kW)
Optimal speed37 mph
Starting effort15,273 lbf
with start valve18,328 lbf
Power Plant
Driver diameter85 in
Boiler pressure200 psi
Expansion typecompound
Cylindersfour, HP: 16 x 24 in
and LP: 20 1/2 x 24 in
Boiler
Grate area20.5 sq ft
Firebox area179.3 sq ft
Tube heating area1,377.8 sq ft
Evaporative heating area1,557 sq ft
Total heating area1,557 sq ft
Calculated Values
steam locomotive
express
Francis William Webb
last changed: 04/2023
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