LNER Class A4 4468 Mallard

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)
Length	70 ft (21.34 m)
Loco weight	102.95 long tons (104.6 t; 115.3 short tons)
Total weight	165 long tons (167.6 t; 184.8 short tons)
Boiler pressure	250 psi (1.72 MPa)
Cylinders	Three
Cylinder size	18.5 in × 26 in (470 mm × 660 mm)
Loco brake	Steam
Train brakes	Vacuum

Type and origin
Type and origin
Power type	Steam
Designer	Nigel Gresley
Builder	LNER Doncaster Works
Serial number	1870
Build date	3 March 1938

LNER Class A4 4468 *Mallard*
LNER Class A4 4468 Mallard
	Mallard at the National Railway Museum, York
Power type
Type and origin
Power type	Steam
Designer	Nigel Gresley
Builder	LNER Doncaster Works
Serial number	1870
Build date	3 March 1938
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)
Length	70 ft (21.34 m)
Loco weight	102.95 long tons (104.6 t; 115.3 short tons)
Total weight	165 long tons (167.6 t; 184.8 short tons)
Boiler pressure	250 psi (1.72 MPa)
Cylinders	Three
Cylinder size	18.5 in × 26 in (470 mm × 660 mm)
Loco brake	Steam
Train brakes	Vacuum
Tractive effort
Performance figures
Tractive effort	35,455 lbf (157.7 kN)
Operators
Career
Operators	LNER, BR
Class	A4
Numbers	LNER (1st): 4468; LNER (2nd): 22; BR (1st): E22; BR (2nd): 60022;
Withdrawn	25 April 1963
Restored	1963
Disposition	On static display at the National Railway Museum, York

LNER Class A4 4468 Mallard is a 4-6-2 ("Pacific") steam locomotive built in 1938 for operation on the London and North Eastern Railway (LNER) at Doncaster Works to a design of Nigel Gresley. Its streamlined, wind tunnel tested^[1] design allowed it to haul long distance express passenger services at high speeds. On 3 July 1938, Mallard broke the world speed record for steam locomotives at 126 mph (203 km/h), which still stands today.

While in British Railways days regular steam-hauled rail services in the UK were officially limited to a 90 mph (140 km/h) 'line speed', before the war, the A4s had to run significantly above 90 mph (140 km/h) just to keep schedule on trains such as the Silver Jubilee and The Coronation,^[2] with the engines reaching 100 mph on many occasions.^[3]^[4] Mallard covered almost one and a half million miles (2.4 million km) before it was retired in 1963.

The locomotive is 70 ft (21 m) long and weighs 165 long tons (168 tonnes, 369,600 lbs), including the tender. It is painted LNER garter blue with red wheels and steel rims.

Mallard is now part of the National Collection and preserved at the National Railway Museum in York.

^ Solomon, Brian (2003). Railway Masterpieces. Newton Abbot: David & Charles. p. 28. ISBN 9780715317433. OCLC 52695896.
^ Yeadon, Willie B. (2004). Named Trains on LNER Lines (Combined ed.). Book Law Publications. p. 157. ISBN 1899624384.
^ Nock, O.S. (1974). The Gresley Pacifics. Vol. 2. David & Charles.
^ The Railway Correspondence and Travel Society (1972). Locomotives of the L.N.E.R. [London & North Eastern Railway]. Part 2A: Tender Engines - Classes A1 to A10. The Railway Correspondence and Travel Society. ISBN 9780901115256.

[1] Solomon, Brian (2003). Railway Masterpieces. Newton Abbot: David & Charles. p. 28. ISBN 9780715317433. OCLC 52695896.

[2] Yeadon, Willie B. (2004). Named Trains on LNER Lines (Combined ed.). Book Law Publications. p. 157. ISBN 1899624384.

[3] Nock, O.S. (1974). The Gresley Pacifics. Vol. 2. David & Charles.

[4] The Railway Correspondence and Travel Society (1972). Locomotives of the L.N.E.R. [London & North Eastern Railway]. Part 2A: Tender Engines - Classes A1 to A10. The Railway Correspondence and Travel Society. ISBN 9780901115256.

[1]

[2]

[3]

[4]