http://www.bbc.co.uk/news/uk-scotland-tayside-central-22705610
This is the track ripped up in the 70's and was used for the M90. The Track bed does exist in parts between Kelty and Kinross, and I have wondered if they could put a nice cycle path up to link up to the path which nearly runs round the whole shore of Loch Leven. I think it also runs through Glen Farg but the bridges have long since gone. Obviously the Mototrway also cuts through it and the line much broken runs down the hill side towards Bridge of Earn behind Dron. It would be a 'nice to have' but I can't see it being rebuilt soon esp as you can take the train to Perth via Fife and Stirling.