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Lancashire & Yorkshire Hughes 4-6-4T “Dreadnought Tanks”
London, Midland & Scottish class 5P
Great Britain | 1924 | 10 produced
Locomotive Magazine, August 1924

Based on the class 8 “Dreadnought”, George Hughes developed a tank locomotive that was also intended for express service. Thanks to the trailing bogie, it now had a 4-6-4T wheel arrangement. The boiler with Belpaire firebox basically resembled the original, but was somewhat lighter. There were no changes to the 75-inch (1,905 mm) diameter driving wheels and the four 16.5-inch (419 mm) diameter cylinders.

Although they had been developed for the Lancashire & Yorkshire Railway, the ten locomotives were directly delivered to the LMS in 1924 and were designated class 5P. They were also known as “Dreadnought Tanks”. However, due to their heavy weight, their possible uses were limited, so that they could only be used between Manchester and Blackpool. A further order for 20 was therefore converted into class 8. The tank locomotives were withdrawn from service between 1938 and 1941.

General
Built1924
ManufacturerHorwich
Axle config4-6-4T (Hudson) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length49 ft 10 1/2 in
Wheelbase40 ft 4 in
Fixed wheelbase13 ft 7 in
Service weight223,888 lbs
Adhesive weight125,440 lbs
Axle load41,815 lbs
Water capacity2,402 us gal
Fuel capacity8,960 lbs (coal)
Power
Power sourcesteam
Estimated power1,450 hp (1,081 kW)
Optimal speed32 mph
Starting effort28,880 lbf
Power Plant
Driver diameter75 in
Boiler pressure180 psi
Expansion typesimple
Cylindersfour, 16 1/2 x 26 in
Boiler
Grate area29.6 sq ft
Firebox area180 sq ft
Tube heating area1,817 sq ft
Evaporative heating area1,997 sq ft
Superheater area343 sq ft
Total heating area2,340 sq ft
Calculated Values
steam locomotive
tank locomotive
express
George Hughes
last changed: 04/2024
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