Engineering works on train lines will mean there will be no trains running between Edinburgh and Fife on Sundays in February and March.
Replacement buses will be serving all stations between Dalgety Bay and Edinburgh on both sides of the Fife Circle line.
To avoid disappointment, ScotRail are urging customers to check journey times before they travel on the ScotRail app or at scotrail.co.uk.
Journey times will be extended and a revised timetable will be in operation, with trains diverted around the works between February 28 and March 12.
On March 19 buses will replace trains between Inverkeithing and Kirkcaldy and services between Edinburgh and Glenrothes via Dunfermline, may depart earlier or later than usual.