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Midland class 480
London, Midland & Scottish class 1F
Great Britain | 1863
232 produced
No. 555 after the rebuild by Johnson
No. 555 after the rebuild by Johnson
Locomotive Magazine, October 1907

Based on the class 240 locomotives, Matthew Kirtley developed the class 480. They had inner and outer frames, with the outer 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 machines were still in use. When the LMS was founded, the locomotives were grouped into power class 1F. Most locomotives were retired around 1930.

General
Built1863-1869
ManufacturerDerby, Dübs & Co., Robert Stephenson & Co., Kitson & Co., Sharp, Stewart & Co., Yorkshire Engine Co.
Axle config0-6-0 (Six-coupled) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase16 ft 5 in
Rigid wheelbase16 ft 5 in
Service weight77,280 lbs
Adhesive weight77,280 lbs
Axle load25,760 lbs
Fuel capacitycoal
Boiler
Grate area15.4 sq ft
Firebox area82 sq ft
Tube heating area1,020 sq ft
Evaporative heating area1,102 sq ft
Total heating area1,102 sq ft
Power Plant
Driver diameter62 in
Boiler pressure140 psi
Expansion typesimple
Cylinderstwo, 16 1/2 x 24 in
Power
Power sourcesteam
Estimated power350 hp (261 kW)
Optimal speed18 mph
Starting effort12,541 lbf
Calculated Values
steam locomotive
freight
Matthew Kirtley
last changed: 04/2023
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