. . "line's extension" . . . "2021-09-20" . . . "Northern line extension to Battersea" . . . "two new Northern line tube stations" . "extension to Battersea" . "extension of the Charing Cross branch from Kennington to Battersea" . . . "extending the Northern line" . . "Northern Line Extension" . "Opened" . "extension of the Northern line" . . . . . "Northern line extension to Battersea Power Station" . . . "extension of the Charing Cross branch" . "2021" . . "2" . "Northern line extension to Battersea" . "extension from" . "extension" . . . . "extended" . "Northern line extension" . "72.4203" . "3218.688" .