Docklands Light Railway is to send out over 4,000 letters next week as the first part of a public consultation exercise for its proposed £75M extension from Silvertown to London City Airport. Transport Minister Lord Whitty has called for construction companies to invest in the project, based on the success of the £260M Lewisham Extension, as a public private partnership. Three routes for the extension are being considered. DLR's favoured route leaves the existing Beckton branch at Canning Town and using the former Silvertown Tramway alignment to the airport. Construction is expected to take place from November 2000 to May 2002.