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LNER Class A4

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LNER Class A4
60009 Union of South Africa in 1951
Power type Steam
Designer H. N. Gresley
Builder LNER Doncaster Works
Build date 1935–1938
Total production 35
Configuration 4-6-2
UIC classification 2'C1h
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Leading wheel diameter 3 ft 2 in (0.965 m)
Driver diameter 6 ft 8 in (2.032 m)
Trailing wheel diameter 3 ft 8 in (1.118 m)
Locomotive weight 102 tons 19 cwt (230,600 lb or 104.6 t)
Locomotive and tender combined weight 167 tons 2 cwt (374,300 lb or 169.8 t)
Fuel type Coal
Fuel capacity 8 tons 0 cwt (17,900 lb or 8.1 t)
Water capacity 5,000 imperial gallons (23,000 l; 6,000 US gal)
Boiler pressure 250 psi (1.72 MPa)
Cylinders Three
Cylinder size 18.5 × 26 in (470 × 660 mm)
Tractive effort 35,455 lbf (157.71 kN)
Locomotive brakes Vacuum
Train brakes Vacuum
60009, 60007 & 60019 have been fitted with air brakes[1]
Power class BR: 8P6F
Number in class 35
Nicknames "Streak"
Withdrawn 1942, 1962–1966
Disposition 6 preserved
Three A4s that have been saved called 60009 Union of South Africa, 60007 Sir Nigel Gresley and 60019 Bittern.

The LNER Class A4 was a type of steam locomotive made in England in 1935. It was designed by Sir Nigel Gresley for the London North Eastern Railway. 35 locomotives were built in total.

They were designed to be very fast and had a very sleek shape. One of them, 4468 "Mallard", is the fastest steam locomotive ever made. It set a world speed record of 125 mph (201.16 km/h) on July 3, 1938.

Six A4s still exist today. The rest were scrapped when steam stopped being used to power trains in Britain.


  1. Fox, Peter; Hall, Peter & Pritchard, Robert (2007). Preserved Locomotives of British Railways (Twelfth edition). Platform 5, Sheffield. ISBN 978-1-902336-57-2 . 

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