Midland class 480
London, Midland & Scottish class 1F
Great Britain 1863 232 produced
Based on the class 240 locomotives, Matthew Kirtley developed the class 480. They had inside and outside frames, with the outside frames being curved. They later formed the basis for the class 700 with 17-inch cylinders. Johnson modernized them, enlarging the cylinders from 16.5 to 17 inches, and on some locomotives to 18 inches. In 1907, 205 of the original 232 locomotives were still in use. When the LMS was founded, the locomotives were grouped into power class 1F. Most locomotives were withdrawn around 1930.
Technical data
General
- Built
- 1863-1869
- Manufacturers
- Derby, Dübs & Co., Robert Stephenson & Co., Kitson & Co., Sharp, Stewart & Co., Yorkshire Engine Co.
- Wheel arrangement
- 0-6-0 (Six-coupled)
- Gauge
- 1,435 mm (Standard gauge)
Dimensions and weights
- Wheelbase
- 5.00 m
- Service mass
- 35.1 t
- Adhesion mass
- 35.1 t
- Rigid wheelbase
- 5.00 m
- Axle load
- 11.7 t
Boiler
- Grate area
- 1.431 m²
- Firebox surface
- 7.618 m²
- Tube heating surface
- 94.761 m²
- Evaporative heating surface
- 102.379 m²
- Total heating surface
- 102.4 m²
Power plant
- Driver diameter
- 1,575 mm
- Boiler pressure
- 9.7 bar
- Expansion type
- simple expansion
- Cylinders
- two, 419 x 610 mm
Power
- Power source
- steam
- Estimated power
- 261 kW (355 PS)
- Starting effort
- 55.8 kN
Calculated values
- Factor of adhesion
- 1 : 6.16
- Optimal speed
- 29 km/h
- Power-to-weight ratio
- 7.4 kW/t
- Heating Surface Equivalent
- 140.5 m²
- Cylinder volume/HSE
- 1 : 1,197.35
- Adhesive weight/Total
- 1 : 1.00
- Tractive force/Heating surface
- 1 : 11.38
- Grate area/Heating surface
- 1 : 71.54
- Firebox/Tube surface
- 1 : 12.44
