The Docklands Light Railway (DLR) is an automated light metro system in the United Kingdom that serves the London Docklands area of east and south-east London, owned by Transport for London (TfL) and currently operated under contract by Serco.
Construction of the DLR was a key component in the regeneration of large parts of the London Docklands from disused industrial land into valuable commercial and residential districts. The first part opened in 1987 serving 15 stations, using redundant railway infrastructure and new construction. The network has been extended and the capacity of its trains expanded so that now nearly 70 million journeys made every year. Stations are in the City of London and the boroughs of Newham, Tower Hamlets, Greenwich and Lewisham with the majority of the network north of the River Thames.
Out of the 45 stations, five of them (Woolwich Arsenal, Island Gardens, Bank, Stratford International and Cutty Sark for maritime Greenwich) are underground.
For over 200 years London's docks and wharves thrived on imperial commerce. From the Pool of London and St Katharine Docks close to the Tower of London they grew eastwards along both sides of the River Thames to include the London Docks, Surrey Docks, Limehouse Dock, West India Docks, Millwall Dock, East India Docks and the three Royal Docks, extending to Barking and becoming the world's largest port. The docks stimulated and supported an extensive network of industrial enterprise such as ship repair, heavy engineering, food processing, warehousing and distribution plus industries based on imported raw materials, particularly tobacco, timber and skins. The expansion of the docks culminated with the King George V Dock, opened by the King in 1921. In the 1930s the docks were at their peak, employing hundreds of thousands of people, but technological and managerial changes and changing patterns of trade led to a gradual decline after World War II. The government started to look at the implications and consequences of possible closures and alternative uses.