The station was to have been built on the W&SR's planned surface railway line in Surrey (now south-west London) from Wimbledon to Sutton.[1] The station was to be on the south side of Central Road. The construction of the railway was approved in 1910.[2] In 1911 the UERL agreed to provide funding for the line's construction and to operate its train services by extending the UERL's District Railway (DR) from Wimbledon station.[3]
Delays in the purchase of land along the railway's route and the outbreak of the First World War prevented the works from commencing; the permission was extended several times, with a final extension granted in 1922.[4] Following the war, the UERL presented new proposals to construct an extension of the City and South London Railway (C&SLR, now part of the Northern line) southward in tunnel from Clapham Common, coming to the surface at Morden, and thence joining the W&SR route. Both DR and C&SLR trains were to run to Sutton.[5][6][7]
The first C&SLR station to the north was to be named "North Morden" and the W&SR station near the village was to be named "South Morden". The plan to extend the C&SLR was opposed by the Southern Railway (SR), the operator of the mainline services through Wimbledon and Sutton. A settlement between the companies agreed that the extension of the C&SLR would end at North Morden (which opened as plain "Morden"), and the W&SR would be taken over and its route would be constructed by the SR.[8]
When the Wimbledon-to-Sutton line was constructed by the SR in the late 1920s, Morden village station was omitted and replaced with Morden South to the north adjacent to London Road, and St Helier to the south on Green Lane.[9]