Editing Northern line (section)

===Integration===
During the early 1920s a series of works were carried out which involved connecting the C&SLR and CCE&HR tunnels to enable an integrated service to be operated. The first of these new tunnels, between the C&SLR's Euston station and the CCE&HR's station at Camden Town, had originally been planned in 1912 but was delayed by the First World War.<ref name="gazette_1">{{London Gazette
| issue = 28665
| date = 22 November 1912
| page = 8798
}}</ref>{{sfn|Horne|2009|p=32}} Construction began in 1922 and this first tunnel opened in 1924.{{sfn|Rose|2016}}{{sfn|Horne|2009|p=32}} The second connection linking the CCE&HR's Embankment and C&SLR's [[Kennington tube station|Kennington]] stations opened in 1926.{{sfn|Rose|2016}}{{sfn|Horne|2009|p=32}} It provided a new intermediate station at [[Waterloo tube station|Waterloo]] to connect to the main line station there and the [[Bakerloo line]]. The smaller diameter tunnels of the C&SLR were also enlarged to match the standard diameter of the CCE&HR and other deep tube lines.{{sfn|Horne|2009|pp=32–33}}