Major engineering works will close parts of Scotland's rail network over the festive season.
The modernisation project will affect services in Glasgow, Edinburgh, Stirling, Aberdeen and Dundee.
Network Rail said the works had been timed to "minimise the impact on passenger services" and take advantage of the holiday period.
However, several lines will be closed and First ScotRail said replacement buses would be in operation.
David Simpson, Network Rail route director for Scotland, said: "The engineering works we have announced are vital to the delivery of important expansion projects across the country.
"We are fully aware of the effect these works will have on passengers and we are working with our partners to ensure that passengers are kept informed about the timetable changes and bus replacement services."
Mr Simpson said the work would help deliver projects such as the Airdrie to Bathgate and Stirling to Alloa to Kincardine lines and the Glasgow Airport Rail Link.
The planned works will include;
Steve Montgomery, First ScotRail's operations and safety director, said: "We have done everything possible to keep inconvenience to an absolute minimum.
"Clearly, some journeys will take longer than normal and our customers should allow more time for travel."
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