A fight may be looming over who gets to tell iPhone and iPod Touch users how late their trains will be.
Software house Agant has launched iTrain, a £4.99 application that gives real-time access to National Rail's journey planning information. This puts it into direct competition with Aspire's £1.79
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iTrainLive, which purports to do the same. iTrainLive is currently App Stores' seventh most popular travel application.
A spokesman for the Association of Train Operating Companies, said iTrain is the only application with legitimate access to National Rail information. She declined to say if National Rail would take action against infringers.
Ra Wilson, National Rail Enquiries' web development manager, described iTrain as "SatNav for passenger rail". It enables the user to find their nearest station and to plan their journey home using the touch screen, he said.
The software uses the device's built-in GPS to find the nearest station anywhere in Britain. The Next Train Home feature allows the user to plan the best route home from there.
Users can save regular journeys for quick planning as well as favourite stations for one-touch access to departure and arrival information.
The software is available online from Apple's App Store via a PC or directly on the iPhone or iPod Touch. Agant will add new functions later, and all upgrades are free.