LNER Class A1

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 the famous 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 ^[7]

Comparison table

The following table lists dimensions of the locomotives:

Dimension	Gresley A1	Thompson A1/1	Peppercorn A1	Tornado
Driver size	6' 8"	6' 8"	6' 8"	6' 8"
Locomotive weight (long tons)	91.35	101.0	104.1	105.2
Tender weight (long tons)	57.90	60.35	60.35	60.90
Coal capacity (long tons)	8.00	9.00	9.00	7.50
Water capacity (imperial gallons)	5,000	5,000	5,000	6,000
Boiler pressure (psi)	180	250	250	250
Cylinders (3)	20" x 26"	19" x 26"	19" x 26"	19" x 26"
Tractive effort (lbf at 85% pressure)	29,835	37,397	37,397	37,397

^ http://www.lner.info/locos/A/a1a3a10.shtml
^ 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
^ Boddy, Neve & Yeadon 1973, p. 192
^ http://www.a1steam.com/