Under the Whyte notation for the classification of steam locomotives, 4-6-2 represents the wheel arrangement of four leading wheels on two axles, six powered and coupled driving wheels on three axles and two trailing wheels on one axle. The 4-6-2 locomotive became almost globally known as a Pacific type after a locomotive built by the Baldwin Locomotive Works in Philadelphia was shipped across the Pacific Ocean to New Zealand.
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👉 4-6-2 in the context of East Coast Main Line
The East Coast Main Line (ECML) is a 393-mile-long (632 km) electrified railway between its northern terminus at Edinburgh Waverley and southern terminus at London King's Cross. Peterborough, Doncaster, York, Darlington, Durham and Newcastle are on the line, which is a key transport artery on the eastern side of Great Britain running broadly parallel to the A1 road. The main line acts as a 'spine' for several diverging branches, serving destinations such as Cambridge, Leeds, Hull, Sunderland and Lincoln, all with direct services to London. In addition, a few ECML services extend beyond Edinburgh to serve other Scottish destinations, such as Stirling, Inverness, Dundee, or Aberdeen.
The line was built during the 1840s by three railway companies, the North British Railway, the North Eastern Railway, and the Great Northern Railway. In 1923, the Railways Act 1921 led to their amalgamation to form the London and North Eastern Railway (LNER) and the line became its primary route. The LNER competed with the London, Midland and Scottish Railway (LMS) for long-distance passenger traffic between London and Scotland. The LNER's chief mechanical engineer Nigel Gresley designed iconic Pacific steam locomotives including Flying Scotsman and Mallard, the latter of which achieved a world record speed for a steam locomotive, 126 mph (203 km/h) on the Grantham-to-Peterborough section on 3 July 1938.
In this Dossier
4-6-2 in the context of Nigel Gresley
Sir Herbert Nigel Gresley CBE (19 June 1876 – 5 April 1941) was a British railway engineer. He was one of Britain's most famous steam locomotive engineers, who rose to become Chief Mechanical Engineer (CME) of the London and North Eastern Railway (LNER). He was the designer of some of the most famous steam locomotives in Britain, including the LNER Class A1 and LNER Class A4 4-6-2 Pacific engines. An A1 Pacific, Flying Scotsman, was the first steam locomotive officially recorded over 100 mph in passenger service, and an A4, No. 4468 Mallard, still holds the record for being the fastest steam locomotive in the world (126 mph).
Gresley's engines were considered elegant, both aesthetically and mechanically. His invention of a three-cylinder design with only two sets of Walschaerts valve gear, the Gresley conjugated valve gear, produced smooth running and power at lower cost than would have been achieved with a more conventional three sets of Walschaerts gear.
4-6-2 in the context of LNER Class A3 4472 Flying Scotsman
No. 4472 Flying Scotsman is an LNER Class A3 4-6-2 "Pacific" type steam locomotive built in 1923 for the London and North Eastern Railway (LNER) at Doncaster Works to a design of Nigel Gresley. It was employed on long-distance express passenger trains on the East Coast Main Line by LNER and its successors, British Railways' Eastern and North Eastern Regions, notably on The Flying Scotsman service, between London King's Cross and Edinburgh Waverley, after which it was named.
Retired from British Railways in 1963 after covering 2.08 million miles (3.35 million kilometres), Flying Scotsman has been described as the world's most famous steam locomotive. It had earned considerable fame in preservation under the ownership of, successively, Alan Pegler, William McAlpine, Tony Marchington, and, since 2004, the National Railway Museum. 4472 became a flagship locomotive for the LNER, representing the company twice at the British Empire Exhibition and in 1928, hauled the inaugural non-stop Flying Scotsman service. It set two world records for steam traction, becoming the first locomotive to reach the officially authenticated speed of 100 miles per hour (161 km/h) on 30 November 1934, and setting the longest non-stop run of a steam locomotive of 422 miles (679 km) on 8 August 1989 while on tour in Australia.
4-6-2 in the context of LNER Class A4 4468 Mallard
LNER Class A4 4468 Mallard is a 4-6-2 ("Pacific") steam locomotive built in 1938 for operation on the London and North Eastern Railway (LNER) at Doncaster Works to a design of Nigel Gresley. Its streamlined, wind tunnel tested design allowed it to haul long-distance express passenger services at high speeds. On 3 July 1938, Mallard broke the world speed record for steam locomotives at 126 mph (203 km/h), which still stands today.
While in British Railways days, regular steam-hauled rail services in the UK were officially limited to a 90 mph (140 km/h) "line speed", before the Second World War, the A4s had to run significantly above 90 mph (140 km/h) just to keep schedule on trains such as the Silver Jubilee and The Coronation, with the engines reaching 100 mph on many occasions. Mallard covered almost one and a half million miles (2.4 million km) before it was retired in 1963.
4-6-2 in the context of 60163 Tornado
LNER Peppercorn Class A1 No. 60163 Tornado is a 4-6-2 "Pacific" steam locomotive completed in 2008 to an original design by Arthur Peppercorn. At the time of completion it was the first new build steam locomotive for the British mainline since 1960, and is the only Peppercorn A1 in existence as the final locomotive of the original class was scrapped in 1966.
The A1 Steam Locomotive Trust launched the project in 1990 and was financed through fundraising initiatives, public donations, and sponsorship deals. Construction began in 1994 at Darlington Works, England with other components manufactured elsewhere, most notably the boiler, which was constructed at Meiningen Steam Locomotive Works in Germany to meet modern EU regulations. Following testing on the Great Central Railway in 2008, Tornado was granted its mainline running certificate in January 2009 and has since worked heritage and mainline trains across Britain.