"extension" . . . . . "Mostly closed" . "Derbyshire Lines" . . . "Great Central Main Line" . "the ''London Extension''" . "Great Central Railway" . "Great Central line" . "railway line" . "extension to London" . . "Banbury branch" . "London extension" . . "1899" . "GCR main line" . "Chesterfield Loop" . "London Extension" . "London extension line" . . "1966" . . "main line" . "Great Central" . "GCR's Main Line" . . . "London to Manchester main line" . "direct route" . . . . . "main line to London" . "Great Central Main Line" . . . "GCML" . "new main line" .