the North London and West London lines. The station would also be served by Crossrail, Great Western Main Line services and Heathrow Express, and the proposals indicate the possibility of interchange with the Bakerloo and Central lines. The plans are supported by the London Borough of Hammersmith and Fulham. In June 2013, the Mayor of London and the London Boroughs of Brent, Ealing and Hammersmith & Fulham released 'vision' consultation documents about the Old Oak Common area. These documents mention various connections to the London Overground system, linking Old Oak to the North London line, West London line, and to two new London Overground branches, to Hounslow, and – via the Dudding Hill Line – to Thameslink stations on the Midland Main Line. In October 2017, Tfl began a public consultation on the construction of two new Overground stations, on the West London line and on the North London line. If built, these stations would provide interchange between London Overground and Old Oak Common station. Thamesmead extension In addition to the plan to extend the Gospel Oak to Barking line to Barking Riverside, there are also proposals to extend it further under the River Thames to a station in Thamesmead, and then on Abbey Wood to connect with the Elizabeth line. Transport for London has confirmed that the Mayor has asked them to look at both the Overground extension from Barking Riverside and a DLR extension, for connecting to Thamesmead. Future acquisitions Following the completion of the first phase of the London Overground network in December 2012, TfL has expressed its intention to take over the operation of other suburban lines in the London area. As with the original London Overground system, this would involve devolving National Rail services from the DfT's franchising system to a TfL-managed concession. On 21 January 2016 it was announced consideration was being given to the possibility of gradually transferring the suburban services operated by Southeastern, South West Trains and Govia Thameslink Railway (Great Northern and Southern) to TfL to create a London Suburban Metro. Past attempts on acquiring routes In 2012–13 TfL and the Greater London Authority publicised a proposal for further expansion, identifying a number of services in North-East and South-East London as suitable candidates. Part of this proposal was fulfilled in May 2015 with the transfer of the Lea Valley and Romford-Upminster Lines out of to the London Overground network, but TfL's