Sir Nigel Gresley

Born	19 June 1876
Died	5 April 1941
Nationality	English
Employer	London & North Western Railway, Crewe (apprentice under F. W. Webb); Lancashire and Yorkshire Railway (Carriage & Wagon Department under H. A. Hoy and George Hughes); Great Northern Railway (Carriage & Wagon Superintendent 1905; Locomotive Engineer 1911–1922); London and North Eastern Railway (Chief Mechanical Engineer 1923–1941)

Sir Herbert Nigel Gresley (1876–1941) was Chief Mechanical Engineer of the London and North Eastern Railway from its formation in 1923 until his death in April 1941, during which time he produced the A1, A3, and A4 Pacific locomotive classes that gave the East Coast Main Line its golden age of steam operation, culminating in the A4 No. 4468 Mallard's world steam speed record of 126 mph on Stoke Bank on 3 July 1938 — a record that has never been broken.

Born at Edinburgh on 19 June 1876, the youngest son of the Rector of Netherseale, Derbyshire, Gresley was educated at Marlborough College and apprenticed at Crewe Works under Francis Webb in 1893 before moving to the Lancashire and Yorkshire Railway's Carriage and Wagon Department. He joined the Great Northern Railway as Carriage and Wagon Superintendent in 1905 and succeeded H.A. Ivatt as Locomotive Engineer in 1911, becoming one of the longest-serving CMEs of any British railway at the age of thirty-four.

Gresley's hallmark was the three-cylinder locomotive with his patented conjugated valve gear, which derived the inside cylinder's valve events from the outside cylinders through a 2:1 lever mechanism — saving weight and complexity compared with three independent valve gears. The K3 2-6-0 and A1 Pacific of 1922 introduced this approach. Following the 1925 exchange trials in which Pendennis Castle convincingly outperformed the A1, Gresley adopted long-travel valves, transforming the Pacifics' performance. Flying Scotsman was the first locomotive to be officially authenticated at 100 mph in 1934. The A4 streamlined Pacifics of 1935, designed for the Silver Jubilee high-speed service to Newcastle, combined Gresley's finest engineering with wind-tunnel-tested bodywork, and the V2 mixed-traffic 2-6-2 of 1936 proved one of the most versatile British locomotives ever built.

Gresley was knighted in 1936. He died in office at Hertford on 5 April 1941, aged 64, having declined to retire when his health deteriorated. Six A4 Pacifics are preserved, including Mallard at the National Railway Museum and three in North America. His legacy extends to the new-build A1 Tornado completed in 2008 to Peppercorn's development of his Pacific concept.

Biography

Sir Herbert Nigel Gresley (1876–1941) was a British locomotive engineer who served as Chief Mechanical Engineer of the London and North Eastern Railway from its formation in 1923 until his death in 1941. He is best known for his three-cylinder Pacifics, the A1, A3 and streamlined A4 classes, and for the A4 No. 4468 'Mallard', which on 3 July 1938 attained 126 mph on the descent of Stoke Bank, the world record for steam traction.

Gresley was born at Edinburgh on 19 June 1876, the youngest son of the rector of Netherseale, Derbyshire. He was educated at Marlborough College and apprenticed at Crewe Works on the LNWR under F. W. Webb in 1893, transferring to the Lancashire & Yorkshire Carriage & Wagon Department at Newton Heath under H. A. Hoy and George Hughes. He joined the Great Northern Railway as Carriage & Wagon Superintendent in 1905 and succeeded H. A. Ivatt as Locomotive Engineer in 1911.

His GNR work introduced his characteristic three-cylinder conjugated valve gear (the 'Gresley gear'), which used the motion of the two outside cylinders to derive the inside cylinder's valve events through a 2:1 lever, saving weight and complication compared with three independent sets of valve gear. Early conjugated locomotives were the K3 2-6-0 and the A1 Pacific of 1922, of which the most famous example, No. 4472 'Flying Scotsman', became Britain's first 100 mph steam locomotive in 1934.

Under the LNER Gresley produced the V2 'Green Arrow' mixed-traffic 2-6-2 of 1936; the streamlined A4 of 1935, originally designed for the Silver Jubilee high-speed service between King's Cross and Newcastle; and the heavy three-cylinder express tank engines of Class U1 (the Garratt Banker on the Worsborough Incline) and P1 heavy mineral 2-8-2.

Gresley was knighted in 1936. He died in office at Hertford on 5 April 1941, aged 64. The post-war LNER continued to build his designs unchanged for several years; at the 1948 nationalisation 'Mallard' and her sisters remained the fastest steam locomotives in the world. Six A4s are preserved.

Locomotives designed

GNR K2 Class — Gresley's 1912 GNR K2 class 2-6-0 — Gresley's first 2-6-0 design, built at Doncaster for GNR mixed traffic. 75 built (10 GNR, 65 LNER). Many lasted into BR days. None preserved.
LNER A3 Class — The improved Gresley Pacific with higher 220 psi boiler pressure, long-travel valves and detailed steam-circuit improvements over the original A1. The class developed in two ways: 27 new-build engines from 1928 onwards, and progressive rebuilding of all 52 A1 Pacifics to A3 standard between 1928 and 1948. The A3 was the East Coast main line's mainstay express engine through the LNER and BR eras until displaced by the Deltic diesels from 1961. One example survives: No. 60103 Flying Scotsman, the most famous British steam locomotive in preservation.
LNER A8 Class — Raven's 1913 NER H1 class 4-4-4T rebuilt by Gresley from 1933 as A8 class 4-6-2T — outer-suburban Pacific tanks for NER/LNER North-Eastern routes. 45 rebuilt. None preserved.
LNER B1 Class — Edward Thompson's two-cylinder mixed-traffic 4-6-0 designed in 1942 as a wartime austerity replacement for the Gresley three-cylinder K3 and B17. 410 were built between 1942 and 1952 at Darlington, Vulcan Foundry and the North British Locomotive Company. The B1 became the LNER's standard general-purpose engine and continued in BR Eastern Region service to 1967. Two are preserved.
LNER B17 Sandringham Class — Sir Nigel Gresley's three-cylinder 4-6-0 designed for the LNER's Great Eastern Section, introduced 1928 to handle the heavier Liverpool Street–Norwich and Norfolk coast expresses. Seventy-three were built at Darlington and the North British Locomotive Company between 1928 and 1937, with detail variations across three sub-classes (B17/1 to B17/6). Names include 25 famous English country houses (the "Sandringham" sub-class) and 25 English football clubs (the "Footballer" sub-class). All withdrawn 1958–1960; none preserved.
LNER Class A1 (Gresley original) — Sir Nigel Gresley's first three-cylinder Pacific design for the Great Northern Railway in 1922, just before the 1923 Grouping. Fifty-two engines were built between 1922 and 1925 at Doncaster and the North British Locomotive Company. From 1928 the class was progressively rebuilt to A3 standard with higher boiler pressure and improved valve gear; the original A1 form was extinct by 1948. The most famous member, No. 4472 Flying Scotsman, was rebuilt to A3 in 1947 and is now preserved at the National Railway Museum.
LNER Class A4 — Sir Nigel Gresley's streamlined three-cylinder Pacific designed for the LNER's Silver Jubilee high-speed service of 1935. Thirty-five engines were built at Doncaster between 1935 and 1938, refined from his earlier A1 and A3 Pacifics with internal-streamlined steam circuits, a 250 psi boiler, and a wedge-shaped air-smoothed casing developed in wind-tunnel tests. The class is most famous for No. 4468 Mallard, which on 3 July 1938 attained 126 mph (203 km/h) descending Stoke Bank, the world steam speed record, never since matched. Six A4s are preserved.
LNER Class P1 — Sir Nigel Gresley's heavy-freight three-cylinder 2-8-2 (Mikado) of 1925, designed to handle 100-wagon coal trains in a single working between Peterborough and London. Two were built at Doncaster, Nos 2393 and 2394, combining the boiler of the contemporary A1 Pacific with eight-coupled drive and a wide firebox. The class proved underused as the LNER's loose-coupled wagon stock could not in practice be marshalled into the long trains the design was intended to haul. Both engines were withdrawn in 1945 without preservation; the design directly influenced Gresley's P2 of 1934.
LNER Class P2 — Sir Nigel Gresley's three-cylinder 2-8-2 (Mikado) express locomotive of 1934, designed specifically for the heavy and gradient-bound Edinburgh–Aberdeen route. Six were built at Doncaster between 1934 and 1936; all six were rebuilt by Edward Thompson in 1943–1944 to A2/2 4-6-2 Pacific form, and the original P2 wheel arrangement was extinct on the LNER from 1944. The original prototype No. 2001 carried the celebrated name Cock o' the North; a new-build P2, No. 2007 Prince of Wales, is currently under construction by the A1 Steam Locomotive Trust.
LNER Class U1 — The unique LNER 2-8-0+0-8-2 Beyer-Garratt articulated locomotive No. 2395, designed by Sir Nigel Gresley and built by Beyer, Peacock & Co. of Manchester in 1925. The largest steam locomotive built for any British railway, the engine was constructed specifically to bank coal trains up the 1-in-40 Worsbrough Bank between Wath and Penistone on the Manchester, Sheffield & Lincolnshire main line. Replaced by the 1500 V dc Manchester–Sheffield electrification in 1949 and withdrawn 1955; not preserved.
LNER Class V2 — Sir Nigel Gresley's three-cylinder mixed-traffic 2-6-2 (Prairie) introduced 1936. 184 engines were built at Doncaster and Darlington between 1936 and 1944, sharing boiler, cylinders and valve gear with the contemporary A4 Pacifics but with smaller 6 ft 2 in driving wheels suited to mixed-traffic versatility. The class became the LNER's standard heavy mixed-traffic engine and was widely admired for its ability to deputise for failed Pacifics on principal East Coast expresses, including the Flying Scotsman. The prototype No. 4771 Green Arrow is preserved at the National Railway Museum.
LNER D11/2 Director — Robinson's 1920 GCR 11F class "Improved Director" 4-4-0 (LNER D11) — Robinson's express 4-4-0. 35 built (11 GCR, 24 LNER for Scottish service). LNER D11 No. 506 "Butler-Henderson" preserved at the National Railway Museum.
LNER D49 Class — Sir Nigel Gresley's three-cylinder 4-4-0 for the LNER, designed in 1927 to provide a modern medium-power passenger engine for the secondary main lines of the North Eastern and Scottish areas. 76 were built between 1927 and 1935, in three sub-classes: the Hunt sub-class (D49/2) named after fox-hunts, the Shire sub-class (D49/1) named after British counties, and a small Reid valve gear sub-class. One has survived into preservation as 246 Morayshire.
LNER D49 Hunt/Shire Class — Sir Nigel Gresley's three-cylinder 4-4-0 designed for the LNER's Scottish and North Eastern Areas, introduced 1927. 76 were built at Darlington between 1927 and 1935 in two named sub-classes: 28 "Shires" named after British counties and 31 "Hunts" named after fox hunts. The remaining 17 were unnamed. The class worked Edinburgh–Aberdeen, Edinburgh–Glasgow and East Coast secondary expresses for over thirty years. One example, No. 246 Morayshire, is preserved at the Bo'ness & Kinneil Railway.
LNER J38 Class — Gresley's 1926 LNER J38 class 0-6-0 — Gresley's heavy goods 0-6-0 for Scottish Region work. 35 built. None preserved.
LNER J39 Class — Gresley's 1926 LNER J39 class 0-6-0 — LNER standard mixed-traffic 0-6-0. 289 built between 1926 and 1941. None preserved.
LNER K3 2-6-0 — Sir Nigel Gresley's three-cylinder 2-6-0 mixed-traffic engine for the Great Northern Railway and (later) LNER, designed in 1920 as a more powerful development of the earlier K2. The K3 was distinguished by its very large 6 ft diameter boiler, the biggest fitted to any British 2-6-0, and was used principally for fast fitted freight and heavy summer Saturday passenger relief work. 193 were built between 1920 and 1937 and none survived into preservation.
LNER K4 Class — Sir Nigel Gresley's three-cylinder 2-6-0 designed specifically for the West Highland Line between Glasgow and Fort William, where heavy gradients and tight curves demanded a powerful but route-cleared mixed-traffic engine. Six were built at Darlington between 1937 and 1939; one, No. 61994 The Great Marquess, survives in preservation. The remaining five were progressively withdrawn between 1959 and 1961.
LNER N2 Class — A Gresley-developed 0-6-2 condenser-fitted suburban tank for the LNER, designed in 1920 for the heavy passenger services into and out of King's Cross including Hertford North and Hatfield. 107 were built between 1920 and 1929 by the North British Locomotive Company, Yorkshire Engine Company, and Doncaster Works. One has survived in preservation: 1744 (later 69523) at the Great Central Railway.
LNER W1 Hush-Hush — The LNER's unique high-pressure compound 4-6-4 No. 10000, designed by Sir Nigel Gresley and built at Darlington in 1929. Originally fitted with a Yarrow marine-type water-tube boiler at 450 psi and four-cylinder compound expansion, the engine was so secretive a project that it was nicknamed "Hush-Hush" by the railway press. Performance disappointing in service; rebuilt in 1937 to a streamlined three-cylinder simple-expansion form, the only British 4-6-4 main-line steam engine. Withdrawn 1959; not preserved.