Background: Rail improvement projects behind schedule, report findspublished at 11:00 British Summer Time 21 September 2016
Major rail improvement projects in Scotland are behind schedule with costs spiralling, according to a report published in July.
Analysis of Network Rail's performance found the electrification of the line between Edinburgh and Glasgow is unlikely to be completed by December.
It has also made "slow progress" on improvements to the Highland mainline and the Aberdeen to Inverness route.
Transport Minister Humza Yousaf said he was "concerned and disappointed" by the report.
He has ordered Transport Scotland officials to carry out a review of the governance of major rail projects.