The Kempton Park steam 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. Each engine is of a similar size to that used in RMS Titanic and rated at about 1008 hp. Each engine could pump 19 million gallons of water a day, to reservoirs at Cricklewood, Fortis Green and Finsbury Park for the supply of drinking water to the north, east & west of London. Raw water was supplied to the waterworks by the Staines and Queen Mary Reservoirs, which stored water collected from the River Thames. They were the last working survivors when they were finally retired from service in 1980. The engines are of an inverted vertical triple-expansion type, tall from basement to the top of the valve casings and each weighing over 800 tons. The engines are thought to be the biggest ever built in the UK. One of the engines, called The Sir William Prescott, has been restored to running order and is the largest fully operational triple-expansion steam engine in the world. It may be seen in steam on various weekends during the year. The engine house also houses two steam turbine water pumps. One of these steam turbines has now been motorised to demonstrate its inner workings. The waterworks is adjacent to the A316, 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. The steam engines now form a museum operated by Kempton Great Engines Trust, a registered charity.
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The 1971 top-ten chart hit "Tap Turns on the Water", by British band CCS, was choreographed for BBC dance troupe Pan's People and was filmed at Kempton Park.
The engines were featured in the Titanic films S.O.S. Titanic and Saving the Titanic. They were even featured in a short scene set in the Titanic's engine room in the film Holmes & Watson. The engines are very similar to the actual engines on board the Titanic albeit the Titanic's engines were 4 cylinders as opposed to three. Yet the Kempton engines are the same size and of the same type. Land-based pumping engines like Kempton Park's have flywheels. Marine steam engines, like Titanic's, do not have flywheels. Though it is commonly claimed that the engine room scenes in the Titanic filmA Night to Remember were filmed at Kempton Park, they were in fact filmed at the sister pumping station in Cricklewood, north London.
The 2000 TV adaptation of Agatha Christie's Poirot story, The Murder of Roger Ackroyd was filmed here for the factory scenes.
