Mr Johnson said: “This is the next big thing. Everybody knows that suburban rail is overcrowded, the service isn’t good enough. It’s a massive opportunity to improve transport in London. We’re doing Crossrail and the Tube upgrade and expanding and improving suburban rail is the next thing.” He added: “If we’re given a say in running overground rail then actually we’ll be able to drive down fares.” Mr Johnson has submitted a document to the Government setting out where he would make improvements. Ministers are said to be “looking seriously” at the proposals, which include: