Also on 13 September 1926, a further connection between the CCE&HR and the C&SLR was opened when tunnels were brought into service from the CCE&HR's Charing Cross station (now Embankment) to Kennington station, the latter having been rebuilt with four platforms. An intermediate station was constructed at Waterloo. Thus fully integrated, combined services operated over the C&SLR and CCE&HR routes using new Standard Stock trains. On tube maps, the combined lines were then shown in a single colour, although the separate names continued in use into the 1930s. Before the introduction of 'Northern line' on 28 August 1937, the names 'Edgware, Highgate and Morden line' and 'Morden-Edgware line' were used in the mid-1930s.