East London line
The East London line is part of the London Overground network. It runs from north to south through  East London. The railway was built in 1869 by the East London Railway Company. It reused the Thames Tunnel which was built for horse-drawn carriages. The line became part of the London Underground network in 1933. It closed on 22 December 2007 for refurbishment and expansion. In April 2010, it reopened as part of the London Overground network. Phase 2, which links the line to the South London line with a terminus at , opened on 9 December 2012. This created an orbital railway around inner London.