Question Author
Thank you to everyone who took the time and trouble to answer. Very much appreciated. It is nice to be able to ask questions and get such friendly helpful answers. Glad to hear there is a ticket office at the Glasgow stations - my poor old man had a terrible time on the London underground with the automatic ticket dispensers!! And thanks for the useful information about changing if travelling from Central. Now that he knows that, he will go from Queen Street, I think. He is travelling on his own from Belfast to Stranraer, and then to Balloch where our daughter will meet him (she's over in Scotland on holiday at Loch Lomond so she doesn't know much about the trains either). He is just a tad apprehensive about it all, and we are trying to work out his journey.
Thanks again to everyone.