ScotRail is to launch a Sunday train service for day trippers to Oban from Edinburgh, Linlithgow and Polmont over six weeks this summer. It will start on Sunday 25 July and run each Sunday until 29 August inclusive.The service is timed to give passengers five hours in the West Highland town. The train will leave Edinburgh Waverley at 08.10 and arrive back in the Scottish capital at 21.07.