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 steamlocomotive 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.
↑Fox, Peter; Hall, Peter & Pritchard, Robert (2007). Preserved Locomotives of British Railways (Twelfth edition). Platform 5, Sheffield. ISBN978-1-902336-57-2.CS1 maint: Multiple names: authors list (link)