This article is about the locomotive before its rebuild. For the locomotive
after its rebuild, see
LNER Thompson Class A1/1.
| 1470 Great Northern |
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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) standard gauge |
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| Leading dia. | 3 ft 2 in (0.965 m) |
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| Driver dia. | 6 ft 8 in (2.032 m) |
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| Trailing dia. | 3 ft 8 in (1.118 m) |
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| Wheelbase | 60 ft 10.6 in (18.56 m) |
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| Length | 70 ft 5 in (21.46 m) |
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| Axle load | 20 long tons (20.3 t; 22.4 short tons) |
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| Adhesive weight | 60 long tons (61.0 t; 67.2 short tons) |
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| Loco weight | 91.35 long tons (92.82 t; 102.31 short tons) |
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| Tender weight | Various |
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| Tender type | Various |
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| Fuel type | Coal |
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| Fuel capacity | 8 long tons (8.1 t; 9.0 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 | 41.25 sq ft (3.832 m2) |
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| Boiler pressure | 180 psi (1.24 MPa) |
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| Heating surface: | |
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| • Firebox | 215 sq ft (20.0 m2) |
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| • Tubes | 1,880 sq ft (175 m2) |
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| • Flues | 835 sq ft (77.6 m2) |
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Superheater:
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| • Heating area | 525 sq ft (48.8 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 | Outside:Walschaerts
Inside: Gresley conjugated |
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| Valve type | Piston valves |
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| Loco brake | Vacuum |
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The Great Northern Railway Class A1 1470 Great Northern was the first of 52 A1 class locomotives. It has also represented three distinct stages in the history of the British 4-6-2 "Pacific" steam locomotives designed by Nigel Gresley for the Great Northern Railway (GNR), a constituent company of the London and North Eastern Railway before the amalgamation of 1923, for which they became a standard design. Eventually Great Northern was completely rebuilt as Class A1/1.