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, Middlesex, London. The were manufactured by Worthington-Simpson. Each engine is of a similar size to that used in RMS Titanic and rated at about 1008 hp. They each pumped 19 million gallons of water a day, to supply north London with drinking water taken from the River Thames. These are the largest triple expansion engines