GNR Class A1 1470 Great Northern

1470 Great Northern [1]
Type and origin
Power typeSteam
DesignerH.N Gresley
BuilderDoncaster Works
Serial number1536
ModelGNR/ LNER A1
Build dateApril 1922
Specifications
Configuration:
 • Whyte4-6-2
 • UIC2′C1 h3
Gauge4 ft 8+12 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)
Wheelbase60 ft 10.6 in (18.56 m)
Length70 ft 5 in (21.46 m)
Axle load20 long tons (20.3 t; 22.4 short tons)
Adhesive weight60 long tons (61.0 t; 67.2 short tons)
Loco weight91.35 long tons (92.82 t; 102.31 short tons)
Tender weightVarious
Tender typeVarious
Fuel typeCoal
Fuel capacity8 long tons (8.1 t; 9.0 short tons)
Water cap.5,000 imp gal (22,700 L; 6,000 US gal)
Firebox:
 • Grate area41.25 sq ft (3.832 m2)
Boiler pressure180 psi (1.24 MPa)
Heating surface:
 • Firebox215 sq ft (20.0 m2)
 • Tubes1,880 sq ft (175 m2)
 • Flues835 sq ft (77.6 m2)
Superheater:
 • Heating area525 sq ft (48.8 m2)
CylindersThree
Cylinder size20 in × 26 in (508 mm × 660 mm)
Valve gearOutside:Walschaerts
Inside: Gresley conjugated
Valve typePiston valves
Loco brakeVacuum
Performance figures
Tractive effort29,835 lbf (132.71 kN)
Career
Operators
Numbers
  • 1470 (1922–23)
  • 1470N (1923–25)
  • 4470 (1925–45)
Official nameGreat Northern
Axle load classRoute Availability: 9
Withdrawn1945 (for rebuilding)
Dispositionrebuilt 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.

  1. ^ Herring: Classic British Steam Locomotives pp. 106–107