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What (who) is A4$528908$ - definition
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![Grosmont]], [[North Yorkshire Moors Railway]], on 4 April 2008, as 60009 ''Union of South Africa'', 60007 ''Sir Nigel Gresley'' and 60019 ''Bittern'' lined up at 7:30 am in preparation for service.](https://commons.wikimedia.org/wiki/Special:FilePath/A4s 20080404 NYMR 040a.jpg?width=200 "Grosmont]], [[North Yorkshire Moors Railway]], on 4 April 2008, as 60009 ''Union of South Africa'', 60007 ''Sir Nigel Gresley'' and 60019 ''Bittern'' lined up at 7:30 am in preparation for service.")
 on his retirement day with Charlie Fisher.jpg?width=200 "George Henry Haygreen (left) on his retirement day with Fireman Charlie Fisher")
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![Lord Faringdon]]'' hauling a train at [[Peterborough railway station]] in 1959.](https://commons.wikimedia.org/wiki/Special:FilePath/Peterborough North 3 geograph-2284111-by-Ben-Brooksbank.jpg?width=200 "Lord Faringdon]]'' hauling a train at [[Peterborough railway station]] in 1959.")
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Wikipedia
The 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 world record as the 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.
