Just seen this on BBC News:
I am not sure that I would want to rely on mobile tickets entirely as mobiles have a habit of crashing, not having signal or running out of battery but I think I could work with a smart card ticket.Paperless rail tickets across UK by 2019 - Chris Grayling
Plans to replace paper tickets on UK trains are to be accelerated, Transport Secretary Chris Grayling has said.
Passengers will be able to use mobile phones and smartcards to travel across most of the network by the end of 2018, he told the Conservative conference.
People "want smart ticketing and we will deliver it"," he said.
Defending the government's rail investment plans, he said all trains in the north of England would either be revamped or replaced by 2020.
And he said the Conservatives - who have been accused of short-changing the north - had electrified four times more of the rail network in the north-west in seven years in power than Labour had done in 13 years.