LNER Class A4 4468 Mallard

Mallard

Mallard at the National Railway Museum at York

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

Specifications Configuration 4-6-2 UIC class 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

Performance figures Tractive effort 35,455 lbf (157.7 kN)

Career Operators LNER, BR Class A4 Withdrawn 25 April 1963 Restored 1986 until 1988 Disposition Displayed at the National Railway Museum, York

London and North Eastern Railway locomotive numbered 4468 Mallard is a Class A4 4-6-2 Pacific steam locomotive built at Doncaster, England in 1938. It is historically significant as the holder of the world speed record for steam locomotives.

The A4 class was designed by Sir Nigel Gresley to power high-speed streamlined trains. The wind-tunnel-tested, aerodynamic body and high power allowed the class to reach speeds of over 100 miles per hour (160 km/h), although in everyday service it rarely attained this speed. While in British Railways days regular steam-hauled rail services in the UK were officially limited to a 90 mph 'line speed', pre-war, the A4s had to run way above 90 mph just to keep schedule on trains such as the Silver Jubilee and Coronation, with the engines reaching the magic three figures on many occasions.Mallard covered almost one and a half million miles (2.4 million km) before it was retired in 1963.

It was restored to working order in the 1980s, but has not operated since, apart from hauling some specials between York and Scarborough in July 1986 and a couple of runs between York and Harrogate/Leeds around Easter 1987. Mallard is now part of the National Collection at the United Kingdom's National Railway Museum in York. On the weekend of 5 July 2008, Mallard was taken outside for the first time in years and displayed beside the three other A4s that are resident in the UK, thus reuniting them for the first time since preservation. It departed the museum for Locomotion, the NRM's outbase at Shildon on 23 June 2010, where it was a static exhibit, until it was hauled back to York on 19 July 2011 and put back on display in its original location in the Great Hall.

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

Mallard is the holder of the world speed record for steam locomotives at 126 mph (203 km/h). The record was achieved on 3 July 1938 on the slight downward grade of Stoke Bank south of Grantham on the East Coast Main Line, and the highest speed was recorded at milepost 90¼, between Little Bytham and Essendine. It broke the German (DRG Class 05) 002's 1936 record of 124.5 mph (200.4 km/h). The record attempt was carried out during the trials of a new quick acting brake (the Westinghouse "QSA" brake).