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LNER Class A4 information


LNER Class A4
60009 Union of South Africa in 1951
Type and origin
Power typeSteam
DesignerNigel Gresley
BuilderLNER Doncaster Works
Build date1935–1938
Total produced35
Specifications
Configuration:
 • Whyte4-6-2
 • UIC2′C1′ h3
Gauge4 ft 8+12 in (1,435 mm) standard gauge
Leading dia.3 ft 2 in (0.965 m)
Driver dia.6 ft 8 in (2.032 m)
Trailing dia.3 ft 8 in (1.118 m)
Length71 ft 38 in (21.650 m)
Width9 ft 0 in (2.743 m)
Height13 ft 1 in (3.988 m)
Loco weight102 long tons 19 cwt (230,600 lb or 104.6 t)
Total weight167 long tons 2 cwt (374,300 lb or 169.8 t)
Fuel typeCoal
Fuel capacity8 long tons 0 cwt (17,900 lb or 8.1 t)
Water cap.5,000 imp gal (23,000 L; 6,000 US gal)
Boiler pressure250 psi (1.72 MPa)
CylindersThree
Cylinder size18.5 in × 26 in (470 mm × 660 mm)
Loco brakeVacuum
Train brakesVacuum
60007, 60009 & 60019 have been fitted with air brakes[1]
Performance figures
Maximum speed90 mph (140 km/h) in regular service (126.4 mph (203.4 km/h) maximum recorded)
Tractive effort35,455 lbf (157.71 kN)
Career
OperatorsLondon and North Eastern Railway, British Railways
ClassA4
Power classBR: 8P6F
Number in class35
NumbersLNER (until 1946/47): 2509–2512, 4462–4469, 4482–4500, 4900–4903;
LNER (from 1946/47): 1–34 (not in order);
BR: 60001–60034
Nicknames"Streak"
LocaleEast Coast Main Line
Withdrawn1942 (1), 1962–1966
Preserved4488, 4489, 4464, 4496, 4498, 4468
DispositionSix preserved, remainder scrapped.

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.[2] 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.

  1. ^ Fox, Peter; Hall, Peter; Pritchard, Robert (2007). Preserved Locomotives of British Railways (Twelfth edition). Platform 5, Sheffield. ISBN 978-1-902336-57-2.
  2. ^ Marsden, Richard. "The Gresley A4 Pacifics". LNER Encyclopedia. Winwaed Software Technology LLC. Retrieved 18 October 2020.

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