Boy obsessed with London Underground map is walking every Tube line - worst so far was 'too short'
Jai, 16, first tackled the entirety of the Victoria line and says walking the route of the Hammersmith and City line has been ...
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London's Underground languages
Pictured above, London's St Pancras, from where trains depart for France and ... by the darkest shades of red on the map to the east of the Victoria Line. A secondary population just to the ...