The flooded railway line between Bangor and Holyhead will remain closed "until tomorrow at the earliest", says National Rail Enquiries.
Buses are replacing trains on the route, with journey times being extended by up to sixty minutes.
Icy by night, chilly by day - brace yourself for a cold week ahead.
High pressure keeps the weather chilly by day, icy by night, with an increasing risk of freezing fog.
High pressure this weeks means mainly cold bright days and icy cold nights.