The station was opened by the South Eastern and Chatham Railway on its branch line to Tattenham Corner as Reedham Halt on 1 March 1911. Situated from Purley railway station, it was built with long platforms and adjoined an overbridge crossing Old Lodge Lane in Purley. It took its name from the nearby Reedham Asylum for Fatherless Children, founded in Richmond by philanthropist Andrew Reed in 1844. The asylum was renamed Reedham Orphanage in 1904 and Reedham School in 1950. It closed in 1980, but the trust which ran it still occupies the original lodge of the estate. After a period of temporary wartime closure between 1917 and 1919, the halt became a station on 5 July 1936. On 12 May 1980, the suffix "Surrey" was added to the station's name to distinguish it from. Some timetables used to refer to the station as "Reedham ". Having first been lengthened in advance of electrification of the line in 1928, the platforms were again extended in 1982 to take eight-car trains in the days when a train had both a driver and a guard. However nowadays, due to lack of station CCTV to assist the driver to close the doors safely, trains without train-mounted external cameras are only permitted to open the doors on the first four carriages. A new passenger footbridge was installed in late 2013, removing the existing disabled access; the platforms were also resurfaced. A request for full disabled access was made to Network Rail and declined in 2014. It has Croydon's lowest passenger count in 2016 and it was the scene of a fatality in 2017. The council car park at Reedham was used as Network Rail's base to replace one of the rail bridges adjacent to the station over Christmas 2016. The telecommunications mast adjacent to the station was increased in size again in 2017 to 25m from 22.5m inline with the planning permission granted in 2016. It was initially proposed that from 2018, when the Thameslink Programme is completed, services on this line would be operated with larger 12 car trains offering all day direct services to via. However, in September 2016, these proposals have been dropped; instead, services on the Tattenham Corner Line are to "remain as SouthernSouth London Metro services with increased capacity as compared to today".
Services
All services at Reedham are operated by Southern. In May 2018, the services at the station were altered and the current off peak service is in trains per hour is:
There are also services to London Victoria during the Monday-Friday peak periods. In, as part of the Thameslink Programme, the service frequency increased to 4 trains per hour and train size was increased mostly to 10 carriages.
