Class A1 in the London and North Eastern Railway's classification system may refer to any of the following British steam locomotives :
The GNR Class A1 or "Gresley A1", a class of 52 Pacific locomotives designed by Sir Nigel Gresley, including Flying Scotsman[1][2]
The LNER Thompson Class A1/1, a single Pacific locomotive designed by Edward Thompson and rebuilt from a Gresley A1 [3][4]
The LNER Peppercorn Class A1, a class of 49 Pacific locomotives designed by A. H. Peppercorn[5][6]
LNER Peppercorn Class A1 60163 Tornado, a new locomotive completed in 2008, officially considered to be the 50th member of its class.[7]
^"LNER Encyclopedia: The LNER A1 and A3 Gresley Pacifics".
^Boddy, M.G.; Neve, E.; Yeadon, W.B. (April 1973). Fry, E.V. (ed.). Part 2A: Tender Engines - Classes A1 to A10. Locomotives of the L.N.E.R. Kenilworth: RCTS. p. 5. ISBN 0-901115-25-8.
^Ian Allan ABC of British Railways Locomotives, summer 1961 edition, part 4, page 26
^Boddy, Neve & Yeadon 1973, p. 174
^Ian Allan ABC of British Railways Locomotives, summer 1961 edition, part 4, pp 26-27
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