Services on the mainline between Glasgow and Edinburgh have been reduced to half hourly.
Problems with overhead power lines near Haymarket in Edinburgh today has resulted in the number of trains stopping at Falkirk High station being reduced to two an hour.
Scotrail has advised that journeys may take up to 30 minutes longer than usual.
The service from Dunblane calling at Larbert and Falkirk Grahamston will terminate at Linlithgow while work continues to rectify the problem.
Passengers are advised to check for the latest updates before travelling.