ScotRail customers will be able to buy and store train tickets directly on their mobile phones.

The rail operator's existing app is being upgraded to allow travellers to download tickets onto their smartphone.

Customers will be able to skip queues at ticket vending machines before "tapping" through gates using Android's NFC feature.

This removes the need for paper tickets and plastic smartcards.

The app is being phased in over the coming months with popular single and return tickets making up the first products available.

Developed by technology firm Rambus, it will be rolled out to all customers in the future.

ScotRail commercial director Lesley Kane said: "This pilot app delivers the convenient, easy access to tickets and travel that we know our customers want.

"Over the coming months, customers will be able to buy and download digital tickets from a single app, anytime, anywhere.

"With the rollout of new trains and station upgrades right across the country too, this is a really exciting time for Scotland's railway as we continue to build the best railway this country has ever had."

Rambus ticketing vice president Russell Mccullagh said: "Delivering a modern and innovative transport experience that customers can rely on is a key driver for smart mobile ticketing.

"We're delighted to combine our expertise developing and deploying high-volume ITSO-based ticketing systems, through our Nevis Technologies joint venture, with ScotRail's drive to provide a truly seamless and leading-edge travel experience."