Concerns raised about single track between Perth and Invernesspublished at 11:39 Greenwich Mean Time 14 November 2018
SNP MSP Gail Ross asks for an update about the Highland mainline phase 2.
Mr Hynes says ScotRail is currently on-site upgrading the line with £60m of investment which is due to end in March.
This will produce regular hourly service from the Highlands to the central belt, he adds.
Green MSP John Finnie raises concerns about the amount of single track from Perth to Inverness and says it is "Sod's law that if a locomotive will break down it will break down on the single track".