Replacing old switches and crossings - the movable sections of track that guide trains from one track to another - with new kit and making changes to the track layout between Bedford and Kettering as part of the Midland Main Line Upgrade.
Installing new track at Heathrow Airport junction to improve reliability.
Signalling upgrades as part of the Weaver to Wavertree resignalling project in Merseyside, to enable more reliable journeys and boost capacity in the area. Signalling areas in Allerton, Speke and Garston were recontrolled to the Manchester Rail Operating Centre over the festive period.
Works at Battersea Pier junction, Christmas Eve
Andrew Haines, chief executive of Network Rail,said: “Over Christmas and New Year thousands of rail workers have been working round the clock to keep the railway running and to deliver crucial improvements to the network as part of the £50bn railway upgrade plan.
“Our decision to do work at this time of year is entirely based on the fact that many regular passengers take this time as holiday, so it causes disruption to the smallest number of people. We really appreciate the patience of those who have been affected by this essential work, which will lead to better and more reliable train services.”