60009 Union of South Africa is a LNER Class A4 steam locomotive built at Doncaster Works on 16 April 1937. It is one of six surviving A4s. Its mainline certification expired in April 2020. As the locomotive is subject to a boiler inspection, it was moved to the East Lancashire Railway as the original plan was to keep it running there until the end of boiler certificate and then send it somewhere else for static display, but a cracked boiler tube forced it into retirement prematurely. It was briefly renamed Osprey during part of the 1980s and 1990s due to political opposition against apartheid in South Africa at the time.

The LNER Class A4 is a class of streamlined 4-6-2 steam locomotive designed by Nigel Gresley for the London and North Eastern Railway in 1935. Their streamlined design gave them high-speed capability as well as making them instantly recognisable, and one of the class, 4468 Mallard, holds the record as the world's fastest steam locomotive. Thirty-five of the class were built to haul express passenger trains on the East Coast Main Line route from London Kings Cross via York to Newcastle, and later via Newcastle to Edinburgh, Scotland. They remained in service on the East Coast Main Line until the early 1960s when they were replaced by Deltic diesel locomotives; they themselves proving to be worthy successors to the A4s. Several A4s saw out their remaining days until 1966 in Scotland, particularly on the Aberdeen – Glasgow express trains, for which they were used to improve the timing from 3.5 to 3 hours.