Passengers arriving at Marylebone station without a ticket are now able to get through the barrier in a matter of moments, without needing to queue at ticket offices, using a new mobile ticketing app from Chiltern Railways.

Rather than a paper ticket, customers can use the app to buy a ticket and will receive a two-dimensional barcode that can be read by special scanners at the ticket barrier when it is displayed on the screen of your mobile phone.

The app can be used from anywhere and remembers payment details and regular journeys, cutting down the time required to buy a ticket for your journey.

In addition, you can purchase tickets for any train journey in the UK via the app and pick them up at ticket vending machines in mainline stations.

Thomas Ableman, marketing director of Chiltern Railways said: "This innovation in ticketing is a first within the rail industry and comes at a time when we are investing £250m on our route to transform rail travel to and from London.

"The Chiltern Mainline will reduce journey times significantly and our app ensures that passengers spend far less time searching for, queuing, buying and printing tickets," he continued.

The app is free and as well as iOS, there are versions for BlackBerry and Nokia handsets, as well as Java-based mobiles. There is also an Android version on the way.

You'll find the iOS version in the App Store - for other platforms you can text 88600 and follow the instructions you receive.

"This app places a ticket machine in the pocket of mobile phone users – providing an enormously convenient and user-friendly means of searching for train times and then buying and displaying tickets," said Ben Whitaker, CEO of Masabi.