Rail passengers between Aberdeen and Inverness will be able to return to the track today after months of being forced to use replacement buses.
The first minister has been warned “warm words are not good enough” after renewing a pledge to improve rail links between Aberdeen and the Central Belt.
The next phase of a major project to cut journey times between the north-east and Highlands is under way.
Transport chiefs are facing calls to “pay back” £200 million to the north-east amid allegations they have turned their back on a decade-long promise to overhaul a “notorious” rail bottleneck.
Council chiefs claim the north-east is working with “one hand tied behind its back” due to rail services lagging behind the rest of the country.
The Scottish Government has been urged to "fast track" transport upgrade plans for the north-east amid fears they could take a decade to be realised.