An amended timetable will operate on Christmas Eve, with services ending earlier than usual at around 10pm.
There will be no services on Christmas Day and Boxing Day.
A limited number of additional services will run from London Waterloo in the early hours of New Year’s Day.
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Major engineering works in the Woking area from December 23 to January 5 will significantly affect services on the main line between London Waterloo and destinations including Southampton, Basingstoke, Portsmouth, Bournemouth and Exeter.
Buses will replace trains between Brockenhurst and Lymington Pier from December 23 to January 3.
Steve Tyler, performance and planning director at SWR, said: “Christmas is always a busy time on the railway and due to service alterations, we recommend customers check journey planners carefully before travelling.
“We’re sorry for any inconvenience this may cause.”
More information about services during the Christmas and New Year period can be found at southwesternrailway.com/christmas.