The snow caused massive disruption on the railways for a fourth successive day today as thousands of passengers suffered a fresh bout of travel chaos.
Passengers were warned they faced disruption to train services in several areas, including Wales, the Midlands, the South West and Yorkshire.
Delays of up to an hour were reported on some routes because of the bad weather which hit services in the South earlier this week.
Chiltern Railways said delays of up to 30 minutes could be expected on all routes to and from London Marylebone during the morning peak hours, while Aylesbury Vale Parkway station was closed.
CrossCountry reported similar half-hour delays on all routes via Birmingham New Street during the morning peak hours.
East Midlands Trains said services between Norwich and Nottingham may be delayed by up to an hour because of heavy snow in the Peterborough area, which also delayed First Capital Connect services between Peterborough and London Kings Cross and Hull Trains services between Peterborough and Kings Cross.
Services between Cambridge and London Kings Cross continued to be amended because of overhead wire problems at Hitchin.
First Great Western services between Bristol Temple Meads and Severn Beach and Oxford and Bicester Town were suspended, and no replacement transport will be provided due to poor road conditions.
Services from Cheltenham Spa to London Paddington will only run between Cheltenham Spa and Swindon, with connections available at Swindon, while services between Frome and London Paddington will not run between Frome and Westbury. No replacement transport will be provided due to poor road conditions and no services will call at Frome.
London Midland said delays of up to 30 minutes could be expected on all routes during the morning peak hours.
National Express East Anglia warned delays of up to an hour could be expected in the Norwich, Peterborough and Cambridge areas because of snow.
Services between Cambridge and Ipswich are currently suspended, with no replacement transport available.
Services between Inverness and Aberdeen were subject to alterations and cancellations and customers were "strongly advised" not to attempt to travel.
Virgin Trains' services on all routes to and from London Euston were subject to delays of up to 30 minutes due to speed restrictions.
Wrexham & Shropshire railways reported delays of up to 30 minutes on all routes to and from London Marylebone during the morning peak hours.