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British Rail Standard class 4 2-6-0
Great Britain | 1952 | 115 produced
flickr/Historical Railway Images

Of the three 2-6-0 BR Standard locomotives, the biggest was the class 4. It was developed by Robert Riddles at Doncaster and based on the LMS Ivatt class 4. Although classified as mixed traffic locomotives, they were primarily intended for use in freight service. But although they had a driver diameter of only 5 ft 3 in, they were nevertheless regularly used in passenger service.

They used the same cylinders as the class 3 tender and tank locomotives, but had a larger boiler and a higher pressure. Like all BR standard locomotives, they had outside cylinders and outside Valve gear. With an axle load as low as 16 tons 15 cwt, they could be operated almost everywhere.

The first 70 were built at Doncaster and 45 more at Horwich. At both of these works, the last class 4 was also the last steam locomotive built there. They were allocated to all BR regions except the Western Region. With a total of 37 and 35, the Scottish and Southern Regions got the most. They were withdrawn between 1964 and 1967 and four are preserved. Three of these have been operational again, with only 76017 being operational today. 76077 is now being restored to be operational again.

General
Built1952-1957
ManufacturerHorwich, Doncaster
Axle config2-6-0 (Mogul) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length60 ft 0 in
Wheelbase24 ft 1 in
Fixed wheelbase15 ft 4 in
Total wheelbase45 ft 11 in
Service weight132,384 lbs
Adhesive weight113,120 lbs
Total weight226,500 lbs
Axle load37,520 lbs
Water capacity4,203 us gal
Fuel capacity13,440 lbs (coal)
Power
Power sourcesteam
Estimated power1,100 hp (820 kW)
Optimal speed29 mph
Starting effort24,172 lbf
Power Plant
Driver diameter63 in
Boiler pressure225 psi
Expansion typesimple
Cylinderstwo, 17 1/2 x 26 in
Boiler
Grate area23 sq ft
Firebox area131 sq ft
Tube heating area959 sq ft
Evaporative heating area1,090 sq ft
Superheater area231 sq ft
Total heating area1,321 sq ft
Calculated Values
steam locomotive
passenger
freight
Robert Arthur Riddles
last changed: 05/2024
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