Disruption is continuing as the after-effects of Storm Ciara are felt across the UK, following widespread flooding and severe gales.
More than 20,000 homes spent the night without power, while flood warnings remain in place across the country.
Network Rail has been assessing damage to lines and passengers are urged to check their routes before travelling.
Yellow weather warnings for snow, ice and wind are also in force for large swathes of the UK.
Forecasters said some areas could see blizzards and up to 20cm (8in) of snow.
Heavy rain and gusts up to 97mph caused widespread flooding and travel disruption on Sunday.
Flooding and debris continue to cause problems for rail passengers. Lines disrupted include the West Coast Main Line, which has no trains running north of Preston because of flooding at Carlisle.
Motorists have also been warned to take extra care. Traffic Scotland said snow and wind were causing difficult driving conditions on the road network.
A warning for wind and snow is in place for the entire day throughout Northern Ireland and most of Scotland.
Parts of northern England have been warned to expect snow and ice from 15:00 GMT.
And Cornwall and the south coast of England have also been issued a warning for wind from 10:00 until 19:00.
So far, the storm has resulted in a month and a half’s worth of rainfall falling within 24 hours for some parts of the UK, resulting in flooding and power cuts for more than half a million households.
Engineers have managed to restore electricity to the vast majority of homes but tens of thousands of households were still without power overnight.
UK Power Networks reported more than 18,500 properties across east and south-east England were still without power on Monday morning, while Western Power Distribution said more than 2,800 homes were in the dark.
Scottish Power also said there were almost 2,000 homes in north Wales without power.
Flights have also been affected by the storm, with hundreds cancelled on Sunday, and dozens more expected on Monday.
Airports have told travellers to check their flight with their airline, with British Airways warning passengers that there might be a “minor knock-on effect” to Monday’s schedule.
Gatwick Airport said it expected some delays and cancellations as it “recovers from the impact of Storm Ciara”.
Forecasters are expecting the unsettled weather to last further into the week – with weather warnings in place until Wednesday.
“While Storm Ciara is clearing away, that doesn’t mean we’re entering a quieter period of weather,” said Met Office meteorologist Alex Burkill.
“It’s going to stay very unsettled.
“We have got colder air coming through the UK and will be feeling a real drop in temperatures, with an increased risk of snow in northern parts of the UK and likely in Scotland.
“There could be up to 20cm (8in) on Monday and Tuesday and with strong winds, blizzards aren’t out of the question.”
On Sunday, the fastest gusts of 97mph were recorded on the Isle of Wight, with 93mph winds hitting Aberdaron, a village at the tip of the Llyn Peninsula.
Please include a contact number if you are willing to speak to a BBC journalist. You can also contact us in the following ways: