Nigel Gresley in the context of "East Coast Main Line"

The Great Northern Railway (GNR) was a British railway company incorporated in 1846 with the object of building a line from London to York. It quickly saw that seizing control of territory was key to development, and it acquired, or took leases of, many local railways, whether actually built or not. In so doing, it overextended itself financially.

Nevertheless, it succeeded in reaching into the coalfields of Nottinghamshire, Derbyshire and Yorkshire, as well as establishing dominance in Lincolnshire and north London. Bringing coal south to London was dominant, but general agricultural business, and short- and long-distance passenger traffic, were important activities too. Its fast passenger express trains captured the public imagination, and its Chief Mechanical Engineer Nigel Gresley became a celebrity.

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.

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.