4464 Bittern is a London and North Eastern Railway (LNER) Class A4 steam locomotive. Built for the LNER on 18 December 1937 at Doncaster Works as works number 1866, it received number 4464. After that it was renumbered 19 on 16 August 1946 under the LNER 1946 renumbering scheme, and finally 60019 by British Railways on 10 October 1948, after nationalisation. Of the 35 strong class, it is one of six to survive into preservation but it is one of only two currently scheduled to be certified for mainline use.