The reference for locomotives and railcars
London & North Western Prince of Wales Tank class ( class 2665 or “5ft 6in Tank (Superheated)”)
London, Midland & Scottish class 4P
Great Britain | 1910 | 47 produced
No. 2273
No. 2273

The Prince of Wales Tanks were 47 4-6-2T tank locomotives which Charles Bowen Cooke had built in Crewe between 1910 and 1916 for the LNWR. As their name suggests, they were referred to as tank versions of the Prince of Wales Class. However, they were more closely related to the Precursor Tanks, which had one less driving axle. They were also known as class 2665 after their running numbers and also as “5ft 6in Tank (Superheated)”.

Twelve locomotives were built without superheaters, but were rebuilt after a short time. The area of operation included, among others, suburban trains from London-Euston. Since the axle load was lower than that of the Precursor Tanks, they could be used more freely. This was the case, for example, on a 120-mile route in Wales. They all came to the LMS in 1923 and were decommissioned there between 1935 and 1941. Their successors were the 2-6-4T tank locomotives designed by Fowler and Stanier.

Axle config4-6-2T (Pacific) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase33 ft 9 in
Fixed wheelbase14 ft
Service weight174,720 lbs172,480 lbs
Adhesive weight99,680 lbs98,560 lbs
Axle load36,960 lbs
Water capacity2,042 us gal
Fuel capacity6,720 lbs (coal)
Power sourcesteam
Estimated power750 hp (559 kW)1,050 hp (783 kW)
Optimal speed25 mph30 mph
Starting effort19,323 lbf22,584 lbf
Power Plant
Driver diameter68.5 in
Boiler pressure175 psi
Expansion typesimple
Cylinderstwo, 18 1/2 x 26 intwo, 20 x 26 in
Grate area23.9 sq ft
Firebox area137 sq ft138 sq ft
Tube heating area1,338 sq ft1,192 sq ft
Evaporative heating area1,475 sq ft1,330 sq ft
Superheater area248 sq ft
Total heating area1,475 sq ft1,578 sq ft
Calculated Values
steam locomotive
tank locomotive
Charles John Bowen Cooke
last changed: 04/2024

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