While some train companies say there will be less disruption than in previous years over Christmas some key lines will be affected by engineering work
A £125 million resignalling project at Bletchley will see services on the London to Glasgow route being cut.
The work means:
There will be no direct services from Euston station in London to Milton Keynes, Birmingham, Manchester, Liverpool or Glasgow on December 23 and 24;
Hourly services will run from Euston via an alternative route (Chilterns) to Nuneaton where passengers will be able to change for services heading to any and all the destinations mentioned above
Direct services resume on Thursday December 27, but with two of the four lines closed up to and including New Year's Eve. This means fewer (but direct) services to the usual destinations.
Other services will also be affected by engineering work.
Affected sections of track include Liverpool Street to Ilford, North Wembley to Watford Junction, and Reading to Oxford.
Some services in and out of London's Victoria will be diverted on December 27.
Blackfriarsmainine station will close early on New Year's Eve and on New Year's Day.