Express In which we look at some underground history Published at 3:01 pm on October 19th, 2007 Filed under: Geekery, In With The Old, Trains. Keyword noise: Bethnal Green, bomb shelter, Chelsea-Hackney Line, City & South London Railway, Crossrail, King William St, London, London Underground, New Works Programme, secret tunnels, shelter, Stockwell, Tower Subway, tunnel, underground, war.