TQ3580 : Tunnel under the Thames – the view south from Wapping Overground station, London
taken 5 years ago, near to Stepney, Tower Hamlets, England
Between 1933 and 2007 the East London Line of the London Underground was a self-contained section of the Metropolitan Line. It ran between Shoreditch in the City and New Cross and New Cross Gate in south London with an interchange at Whitechapel. I recall travelling in the 1960s on the run-down, shabby line with a deep sense of unease.
Formerly the East London Railway it had opened in 1869, making use of the twin-bore Thames Tunnel built by the Brunels, father and son, between 1825 and 1843 for horse-drawn carriages between Wapping and Rotherhithe. As the East London Line it served workers at both London Docks and Surrey Docks.
Since 2010 Transport for London has realised the full potential of the line by extending it over existing tracks, plus a bridge or two, north to Highbury & Islington and south to Clapham Junction, West Croydon and Crystal Palace, connecting with other rail services. It has become a busy and vital section of the London Overground. The new station at Canada Water has an important interchange with the London Underground's Jubilee Line.
Wikipedia has a full account: Link