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LNER Class A8

A8 4-6-2T No. 69873 at Middlesbrough Locomotive Depot 1954

Type and origin
Power type	Steam
Designer	Vincent Raven and Nigel Gresley
Build date	1931–1936
Total produced	45

Specifications
Configuration:
• Whyte	4-6-2T
• UIC	2′C1′ h3t
Leading dia.	3 ft 1+1⁄4 in (0.946 m)
Driver dia.	5 ft 9 in (1.753 m)
Trailing dia.	3 ft 9 in (1.143 m)
Wheelbase	33 ft 3 in (10.13 m)
Length	42 ft 6 in (12.95 m)
Axle load	17.8 long tons (18.1 t; 19.9 short tons)
Loco weight	86.8 long tons (88.2 t; 97.2 short tons)
Fuel capacity	4 long tons (4.1 t; 4.5 short tons)
Water cap.	2,000 imp gal (9,100 L; 2,400 US gal)
Firebox:
• Grate area	23 sq ft (2.1 m²)
Boiler	4 ft 9 in (1.45 m)
Boiler pressure	175 psi (1.21 MPa)
Heating surface:
• Firebox	124 sq ft (11.5 m²)
• Tubes	680 sq ft (63 m²)
• Flues	280.6 sq ft (26.07 m²)
• Total surface	1,084.6 sq ft (100.76 m²)
Superheater:
• Heating area	191.134 sq ft (17.757 m²)
Cylinders	3
Cylinder size	16+1⁄2 in × 26 in (419 mm × 660 mm)
Valve gear	Stephenson

Performance figures
Tractive effort	22,940 lbf (102.0 kN)

Career
Operators	London and North Eastern Railway, British Railways
Withdrawn	1957–1960
Disposition	All scrapped

The London and North Eastern Railway (LNER) Class A8 was a type of 4-6-2 T steam locomotive, designed by both Vincent Raven and Nigel Gresley. They were rebuilt from the LNER Class H1s, a 4-4-4 T class.