Network Rail says the first phase of the project to build stations and a new railway track will begin shortly.
Network Rail interim report published into crash that killed three people in August.
Engineers on site assessing impact of landslip between Lochailort and Glenfinnan.
High winds and sea spray are causing overhead electric wires to trip in North Ayrshire.
The major engineering works at Haymarket East Junction were completed over the festive period.
ScotRail has warned rail users there will be no trains running to or from Edinburgh until Sunday.