Around 4,500 engineers will work to complete infrastructure upgrades across the country during Christmas and New Year.
Schemes include renewing and replacing signalling/overhead power lines at locations around Glasgow, new tracks will be laid on sections of the west coast main line, and on the main line between Edinburgh and Glasgow, and a junction in Lanarkshire will also be renewed.
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Work on the electrification of the network will also continue with new overhead powerlines and supporting equipment being installed on sections of the Stirling-Alloa-Dunblane route and further progress being made on the upgrade of tracks and platforms at Edinburgh Waverley.
Elsewhere, workers will work to refurbish and maintain bridges, level crossing and tracks.
Mark Carne, chief executive of Network Rail, said: "Thousands of passengers are on the cusp of seeing their rail journeys transformed in the months ahead as our massive £50bn Railway Upgrade Plan reaches its final stages with the introduction of thousands of new services now just around the corner.
"This Christmas will see over 30,000 dedicated and hardworking railway people working round the clock to deliver a bigger and better railway for the millions of people who rely on it every day.
"While most of the network is open for business as usual, some routes are heavily affected and so we strongly advise passengers to plan ahead this Christmas."
(LM/MH)
