The branch, double track and electrified on the DC third-rail system, was the last line built by the Southern Railway. It was to serve the housing, industrial, engineering and storage developments south of Surbiton and secondly, never realised, to form a corollary line to. It was opened on 29 May 1938 from Motspur Park to, with an intermediate station at, and extended on 28 May 1939 to and. All the stations on the line were of concrete in an Art Deco style, typical of the period. Work to extend beyond Chessington was halted by the outbreak of World War II, with track laid beyond Chessington South as far as Chalky Lane, and preparatory works continuing further south. This included an embankment built by the Royal Engineers as a military exercise from Chalky Lane as far south as Chessington Wood, close to where the next station at Malden Rushett would have been built. A second station to serve Ashtead, namely at its northern extreme, was also planned. After the wargreen belt legislation put a stop to any resumption because Ashtead Common was given protective status. A goods yard south of Chessington South was used as a coal concentration depot from the mid-1960s to the end of the 1980s. The goods yard and the of trackbed towards Malden Rushett are overgrown by trees. Two platforms were built at Chessington South but as a result of the truncation, only one platform has ever been in public use. It was originally intended to name Chessington North stationChessington Court and Chessington South stationChessington Grange. The line was mainly constructed on embankment with short distances in cuttings and several bridges. A viaduct crosses the Hogsmill River near Malden Manor. Demand and population in the area increased after the railway's relatively late introduction. Malden Manor station is the line's busiest with 0.60 million journeys made in the 2014-2015 financial year. Its recorded use was 0.58 million ten years before. The total of journeys per year of the four stations on the line has reached 2.219 million recorded journeys. Malden Manor station has formally been assigned E status as its station category.
