Sir Nigel Gresley

A4 Class number 4498 steam locomotive

Named after Sir Herbert Nigel Gresley (1876–1941), one of Britain's most famous steam locomotive engineers, who rose to become Chief Mechanical Engineer of the London and North Eastern Railway (LNER).
The locomotive is now preserved at the North Yorkshire Moors Railway, and is in daily operation, following a 10 year overhaul to working order. It is owned by Sir Nigel Gresley Locomotive Preservation Trust Ltd. and operated by the A4 Locomotive Society Ltd. on behalf of the Trust.

By Brian the Emphonium @ Flickr