| LNER Thompson Class A2/2 |
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| Type and origin |
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| Power type | Steam |
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| Designer | Edward Thompson |
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| Build date | 1934-1936 |
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| Total produced | 6 |
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| Rebuild date | 1943-1944 |
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| Specifications |
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Configuration:
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| • Whyte | 4-6-2 |
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| • UIC | 2’C1 h3 |
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| Gauge | 4 ft 8+1⁄2 in (1,435 mm) |
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| Leading dia. | 3 ft 2 in (0.965 m) |
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| Driver dia. | 6 ft 2 in (1.880 m) |
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| Trailing dia. | 3 ft 8 in (1.118 m) |
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| Wheelbase | 63 ft 0.875 in (19.22 m) |
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| Length | 72 ft 8.375 in (22.16 m) |
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| Adhesive weight | 66 long tons (67 t; 74 short tons) |
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| Loco weight | 101.5 long tons (103.1 t; 113.7 short tons) |
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| Fuel type | Coal |
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| Fuel capacity | 9 long tons (9.1 t; 10 short tons) |
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| Water cap. | 5,000 imp gal (22,700 L; 6,000 US gal) |
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| Firebox: | |
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| • Grate area | 50 sq ft (4.6 m2) |
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| Boiler pressure | 225 psi (1.55 MPa) |
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| Heating surface: | |
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| • Firebox | 237 sq ft (22.0 m2) |
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| • Tubes | 1,004.5 sq ft (93.32 m2) |
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| • Flues | 1,211.57 sq ft (112.559 m2) |
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| • Total surface | 2,453 sq ft (227.9 m2) |
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Superheater:
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| • Heating area | 619.67 sq ft (57.569 m2) |
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| Cylinders | Three |
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| Cylinder size | 20 in × 26 in (508 mm × 660 mm) |
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| Valve gear | Walschaerts |
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| Valve type | Piston valves |
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The London and North Eastern Railway Class A2/2 was a class of six 4-6-2 steam locomotives rebuilt by Edward Thompson in 1943 and 1944 from his predecessor Sir Nigel Gresley's P2 Class of 2-8-2 express passenger locomotives. The rebuilds improved reliability and reduced maintenance, but also suffered from a variety of issues during service, and all were withdrawn and scrapped between 1959 and 1961.
