GNR Class A1 1470 Great Northern

1470 Great Northern [1]
Type and origin Power type Steam Designer H.N Gresley Builder Doncaster Works Serial number 1536 Model GNR/ LNER A1 Build date April 1922
Specifications Configuration: ​  • Whyte 4-6-2  • UIC 2′C1 h3 Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Leading dia. 3 ft 2 in (0.965 m) Driver dia. 6 ft 8 in (2.032 m) Trailing dia. 3 ft 8 in (1.118 m) Wheelbase 60 ft 10.6 in (18.56 m) Length 70 ft 5 in (21.46 m) Axle load 20 long tons (20.3 t; 22.4 short tons) Adhesive weight 60 long tons (61.0 t; 67.2 short tons) Loco weight 91.35 long tons (92.82 t; 102.31 short tons) Tender weight Various Tender type Various Fuel type Coal Fuel capacity 8 long tons (8.1 t; 9.0 short tons) Water cap. 5,000 imp gal (22,700 L; 6,000 US gal) Firebox: ​  • Grate area 41.25 sq ft (3.832 m2) Boiler pressure 180 psi (1.24 MPa) Heating surface: ​  • Firebox 215 sq ft (20.0 m2)  • Tubes 1,880 sq ft (175 m2)  • Flues 835 sq ft (77.6 m2) Superheater: ​  • Heating area 525 sq ft (48.8 m2) Cylinders Three Cylinder size 20 in × 26 in (508 mm × 660 mm) Valve gear Outside:Walschaerts Inside: Gresley conjugated Valve type Piston valves Loco brake Vacuum
Performance figures Tractive effort 29,835 lbf (132.71 kN)
Career Operators Great Northern Railway London and North Eastern Railway Numbers 1470 (1922–23) 1470N (1923–25) 4470 (1925–45) Official name Great Northern Axle load class Route Availability: 9 Withdrawn 1945 (for rebuilding) Disposition rebuilt as LNER Thompson Class A1/1

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.