Nigel Gresley was a famous designer of what means of transport?

Sir Herbert Nigel Gresley CBE (19 June 1876 – 5 April 1941) 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. The Flying Scotsman was the first steam locomotive that officially recorded over 100 mph. The Mallard which still holds the record for being the fastest steam locomotive in the world at 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.

A memorial plaque to Gresley's achievements was unveiled at Edinburgh Waverley railway station in 2001. It was created by the Gresley Society and incorporates line drawings of his Flying Scotsman and Mallard locomotives. The LNER Class A4 4498 Sir Nigel Gresley is named after its designer and can still be seen in use on the North Yorkshire Moors Railway.