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Lancashire & Yorkshire class 25
London, Midland & Scottish class 2F
Great Britain | 1876 | 280 produced
LMS 12031, ex No. 944
LMS 12031, ex No. 944
collection F. Verrall

Directly after his appointment as superintendent of the Lancashire & Yorkshire, William Barton Wright designed the class 25 as a standard goods locomotive. Between 1876 and 1887, different commercial manufacturers and the LYR's own Miles Platting workshops produced a total of 280 of these locomotives also called “Ironclads”. The first 72 had a smaller boiler than the remaining 208.

Between 1891 and 1900, 230 were rebuilt to class 23 saddle tank locomotives. At the LMS, the non-rebuilt locomotives were classed in power class 2F. Withdrawals commenced in 1930, but 23 managed to survive into BR ownership. The last ones were withdrawn in 1959. The only non-rebuilt locomotive that was preserved is BR 52044, former LYR 957 and now running on the Keighley & Worth Valley Railway. Class 23 No. 752 is now running on the East Lancashire Railway, carrying the fictitious BR No. 51456.

Variantsmaller boilerlarger boiler
ManufacturerBeyer, Peacock & Co., Vulcan Foundry, Sharp, Stewart & Co., Kitson & Co., Miles Platting
Axle config0-6-0 (Six-coupled) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase15 ft
Fixed wheelbase15 ft
Service weight83,216 lbs85,344 lbs
Adhesive weight83,216 lbs85,344 lbs
Total weight143,920 lbs146,048 lbs
Axle load28,560 lbs29,904 lbs
Water capacity2,702 us gal
Fuel capacitycoal
Power sourcesteam
Estimated power450 hp (336 kW)475 hp (354 kW)
Optimal speed16 mph
Starting effort17,547 lbf19,512 lbf
Power Plant
Driver diameter54 in55.5 in
Boiler pressure140 psi160 psi
Expansion typesimple
Cylinderstwo, 17 1/2 x 26 in
Grate area19 sq ft19.5 sq ft
Firebox area90.5 sq ft89 sq ft
Tube heating area970.5 sq ft946 sq ft
Evaporative heating area1,061 sq ft1,035 sq ft
Total heating area1,061 sq ft1,035 sq ft
Calculated Values
steam locomotive
William Barton Wright
last changed: 05/2024

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