High speed mobile broadband is to be rolled out across the busiest parts of the UK's rail network, the Transport Secretary has announced.
Speaking at the Conservative Party conference, minister Patrick McLoughlin said the Department for Transport wanted to bring quicker internet access to 70% of all train journeys in Britain by 2019.
Mr McLoughlin said there were "few things more frustrating than trying to phone a friend or access the internet, only to be thwarted by a bad signal".
But Labour questioned whether the pledge would include the Great Western line – where passengers complain about the lack of any connection.
Luke Pollard, Labour's parliamentary candidate in Plymouth Sutton and Devonport, said: "Labour will continue to push for cast iron guarantees that passengers travelling on Great Western services will be able to use wi-fi soon."