Snow and heavy winds have brought travel disruption as temperatures plummeted to minus 11C overnight.
Large parts of the UK continue to face yellow weather warnings for snow and ice on Thursday, with another “very cold night” expected.
Commuters suffered travel disruption, with rail lines and airport runways closed.
Transport for Wales closed some rail lines in the country due to track damage following a period of “heavy wind, rain and snow”.
Buses will replace trains between Llandudno Junction and Blaenau Ffestiniog until at least Monday.
Meanwhile, a fault with the signalling system is causing major disruption between Crewe and Wilmslow, affecting Avanti West Coast, CrossCountry, Northern and Transport for Wales services.
Great Western Railway also said flooding means the line between Liskeard and Looe in Cornwall is closed.
The Met Office has said Wednesday night’s coldest temperature was recorded at Shap in Cumbria at minus 11.2C.
Temperatures had been forecast to plummet as low as minus 16C overnight.
A Met Office spokeswoman told the PA news agency they are “expecting tonight to be another very cold night”.
Temperatures are expected to turn less cold from the North West over the weekend.
A yellow warning for snow and ice is in place for northern Scotland until midnight, with the Met Office warning of sleet and snow showers, as well as ice on untreated surfaces.
Snow and ice warnings for Northern Ireland, Cornwall, much of Wales and parts of north-west England have been issued until 11am.
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