GNR Class A1 1470 Great Northern

Specifications
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

1470 Great Northern
1470 Great Northern
Power type
Type and origin
Power type	Steam
Designer	H.N Gresley
Builder	Doncaster Works
Serial number	1536
Model	GNR/ LNER A1
Build date	April 1922
Configuration:;
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
Tractive effort
Performance figures
Tractive effort	29,835 lbf (132.71 kN)
Operators
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.