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LNWR 2665 Class "5ft 6in Tank (Superheated)"
No. 2273
Type and origin Power type Steam Designer Charles Bowen Cooke Builder LNWR Crewe Works Serial number 4950–69, 5080–96, 5347–56 Model 1910–1916 Total produced 47
Specifications Configuration: ​  • Whyte 4-6-2T  • UIC 2′C1 n2t Gauge 4 ft 8+1⁄2 in (1,435 mm) Leading dia. 3 ft 3 in (0.991 m) Driver dia. 5 ft 8+1⁄2 in (1.740 m) Trailing dia. 3 ft 3 in (0.991 m) Loco weight 78 long tons (79 t) Boiler pressure 175 lbf/in2 (1.21 MPa) Heating surface Saturated: 1,475 sq ft (137.0 m2) Superheated: 1,330 sq ft (124 m2) Cylinders Two Cylinder size Saturated: 18+1⁄2 in × 26 in (0 m × 1 m) Superheated: 20 in × 26 in (508 mm × 660 mm) Valve gear Joy Valve type Piston valves
Career Operators London and North Western Railway London, Midland and Scottish Railway Class 5ft 6in Tank (Superheated) Power class LMS: 4P Nicknames Prince of Wales Tank Withdrawn 1935–1941 Disposition All scrapped

The London and North Western Railway (LNWR) Prince of Wales Tank Class was a Pacific tank engine version of the Prince of Wales Class 4-6-0 steam locomotive.

Bowen-Cooke's predecessor George Whale had built 50 related Precursor Tank Class 4-4-2 engines. In terms of familial relationships, Prince of Wales Tank was both a superheated and extended version of the Precursor Tank, and a version of the Prince of Wales Class 4-6-0 steam locomotive with side tanks and a bunker which necessitated an extension to the frames and trailing pony truck. They were used on suburban services out of Euston station and from an early date also used on passenger services between Shrewsbury and Swansea (Victoria) over the steeply-graded Central Wales line, a journey of some 120 miles.

The LNWR built 47 of the superheated tanks between 1910 and 1916 under Charles Bowen-Cooke.

All passed onto LMS ownership on the 1923 grouping. The LMS renumbered them 6950–6996 and gave them the power classification 4P. Withdrawals started in 1935, their replacements being Class 4 2-6-4T designs by Fowler and Stanier. All were gone by 1941, and no examples were preserved.

• Baxter, Bertram (1979). Baxter, David (ed.). British Locomotive Catalogue 1825–1923, Volume 2B: London and North Western Railway and its constituent companies. Ashbourne, Derbyshire: Moorland Publishing Company. pp. 290–291. ISBN 0-903485-84-2.
• Casserley, H. C. & Johnston, Stuart W. (1974) [1966]. Locomotives at the Grouping 3: London, Midland and Scottish Railway. Shepperton, Surrey: Ian Allan. p. 79. ISBN 0-7110-0554-0.

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