London & North Western Alfred the Great class
London & North Western 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.
Technical data
General
- Built
- 1901-1903
- Manufacturers
- Crewe
- Wheel arrangement
- 4-4-0 (American)
- Gauge
- 1,435 mm (Standard gauge)
Dimensions and weights
- Service mass
- 58.9 t
- Adhesion mass
- 37.6 t
- Total mass
- 86 t
- Axle load
- 18.8 t
- Water capacity
- 9,093 l
Boiler
- Grate area
- 1.905 m²
- Firebox surface
- 16.653 m²
- Tube heating surface
- 127.997 m²
- Evaporative heating surface
- 144.65 m²
- Total heating surface
- 144.7 m²
Power plant
- Driver diameter
- 2,159 mm
- Boiler pressure
- 13.8 bar
- Expansion type
- compound
- Cylinders
- four, HP: 406 x 610 mm and LP: 521 x 610 mm
Power
- Power source
- steam
- Estimated power
- 652 kW (886 PS)
- Starting effort
- 67.9 kN
- Starting effort simple
- 81.5 kN
Calculated values
- Factor of adhesion
- 1 : 5.43
- Optimal speed
- 60 km/h
- Power-to-weight ratio
- 11.1 kW/t
- Heating Surface Equivalent
- 227.9 m²
- Cylinder volume/HSE
- 1 : 1,263.46
- Adhesive weight/Total
- 1 : 1.57
- Tractive force/Heating surface
- 1 : 9.81
- Grate area/Heating surface
- 1 : 75.93
- Firebox/Tube surface
- 1 : 7.69
