Delays of up to 40 minutes on CrossCountry between Edinburgh Waverley and Glasgow Central due to signalling problem at Motherwell.
Affecting all services through Motherwell.
There is currently no estimate for when a normal service will resume.
More top news
A Polish couple who had gone to Manchester Arena to collect their daughters were killed, the Polish Foreign Ministry has announced.
Some children, particularly those who have been more directly affected, may show symptoms of stress and trauma.
This footage of the moment a biker was killed has been released by his fiancée in a bid to prevent similar tragedies.