 The LSWR began to look at electrification of suburban services during the 1910s, using a 600 volt DC third rail mechanism.The first such service to Wimbledon via East Putney opened on 25 October 1915, with services to Shepperton following on 30 January 1916, the Hounslow Loop Line on 12 March and on 18 June.Ownership of Waterloo underwent a succession, broadly typical of many British stations.