By Lucy Ashton
The Dalmuir to Balloch line, which includes Dumbarton Central station and Dalreoch, will also be affected by the works.
However, Helensburgh Upper, Garelochhead and Arrochar and Tarbet will also be affected as there will be no trains between Glasgow Queen Street and Crianlarich at the same time.
It insisted this is the “best time” for it to conduct major projects because of the drop in passenger numbers, as commuter and business travel diminish.
Passengers are being urged by Network Rail to check online journey planners and reminded that “booking ahead is essential as some lines will be very busy”.
Network Rail’s chief network operator Helen Hamlin said: “The period between Christmas and New Year is the quietest on the railway and it’s the best time for us to do the major projects that will take longer than a night or a weekend to complete.
“We work with train operators to organise diversions and rail replacement buses for passengers who are travelling, but it’s still so important to plan ahead.
“That’s especially the case this year as we have some very big plans for improving the railway that will mean people may have to travel home on different routes after Christmas than the way they travelled out.”
The entire railway network will shut down on Christmas Day and most operators will also run no trains on Boxing Day, but a handful will have a very limited timetable.
Daniel Mann, director of industry operations at industry body the Rail Delivery Group, said: “You can use National Rail enquiries and journey planners to check for updates, and our visual disruption maps – short videos designed to help people understand service changes and make informed travel decisions – will also be available in stations and online.