lost its regular services on the Brighton Main Line . Nevertheless, the Southern Railway extended the LBSCR's AC overhead electric system powered at 6700 V to the station in 1925, only to announce a year later that all AC lines were to be converted to the 660 V DC used by the neighbouring London and South Western Railway. This entailed the conversion of Coulsdon North to third rail in September 1929. It was one of the last to move across from the old overhead electric system. Decline and closure The situation of Coulsdon North on the so-called "fast track" of the Quarry Line posed pathing problems, as the route had to give priority to express services heading for the South Coast. Accordingly, through services to the coast were withdrawn, and the fast platforms saw only occasional use for special trains. Furthermore, the opening of Smitham (now called Coulsdon Town) in 1904 had created three stations in the same area and, by the 1960s, the decline had begun to set in. Only the terminal platforms were regularly used, for stopping trains from Victoria or London Bridge. Weekend passenger services were withdrawn in 1965, the goods yard was closed in 1968, and from May 1970, passenger services only operated at peak hours on weekdays. The station finally closed in 1983 as part of the resignalling of the Brighton main line. The last passenger train ran on the evening of Friday 30 September 1983, a special to East Croydon. The station and its sidings were officially closed as of Monday 3 October 1983. The station was demolished shortly afterwards. During an archaeological excavation in March 1994, the arched foundation brickwork of the station subway was found. The site of the station buildings has since been redeveloped with small industrial units. In 2006 the A23 Coulsdon Relief Road was constructed through its site. Only the station approach road, alongside which are a few sections of railway fencing, indicate its former site. 1907 accident On 17 April 1907, a locomotive, operated under the instructions of the station master, overran its intended stop point, mortally injuring a local resident who without the train crew's knowledge was lying in the path of the train as part of filming by the Clarendon Film Company. 1910 accident On 29 January 1910 the Brighton to London Victoria express split in two when passing points at the station and the rear