The Flowering of Overground lines & colours - How Soon is Now? - London Reconnections
London Victoria and South London resignalling programme - Network Rail
London Underground Victoria Line, RailTransportinLondon Wiki
Public transport in Victorian London – underground
Bakerloo Line extension 'firmly on track' for 2030 opening
London Overground to be split into separate lines
Northern line extension: Two new Tube stations open - BBC News
Would a Victoria line extension into South London along with the Bakerloo line be beneficial? : r/LondonUnderground
The 50th anniversary of the Victoria line extension to Brixton
London Underground, Overground, DLR, Tramlink and National Rail Services in BNS : r/TransitDiagrams
TfL considering London Overground extension to London Bridge