The Kempton Park steam engines (also known as the Kempton Great Engines) are two large triple-expansion steam engines, dating from 1926–1929, at the Kempton Park Waterworks in south-west London. They were ordered by the Metropolitan Water Board and manufactured by Worthington-Simpson in Newark-On-Trent. The waterworks is adjacent to the A316 (just before it becomes the M3 motorway), between Sunbury-on-Thames and Hanworth. The same site also features a 2-foot gauge steam railway, the Kempton Steam Railway, the largest steam railway offering rides to the public on selected days, in London.