As part of the Scottish Government-funded investment, engineers have been working to simplify and upgrade the track layout – clearing bottlenecks and making the junction more reliable.
Overhead power infrastructure and signalling systems have also been replaced or renewed during the project.
Since the closure of the line at the start of March, engineers have:
• installed 7km of track and laid more than 10,000 new sleepers.
• Installed 135 new overhead line structures and renewed 22km of wiring
• Run out 75km of new signalling cables.
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During the final phase of the modernisation works, which will take place between now and early June, the WCML section of the junction will continue to close on weekends.
With more weekday services on the key cross-border route restored, work now focusses on further signalling and overhead wire renewals on sections of track towards Glasgow and Edinburgh and on work to remodel Carstairs station’s platforms ahead of it reopening on Tuesday, May 30 - when ScotRail services will resume.
The closure of Carstairs junction affects cross-border train operators including Avanti West Coast, Caledonian Sleeper, CrossCountry and TransPennine Express, who have been operating via diversionary routes or offering alternative journey options during these vital improvements.
Jim McCleary, Network Rail programme manager for the Carstairs junction remodelling project, said: "The reintroduction of direct services between Glasgow and Carlisle is fantastic news for passengers.
"Carstairs junction was coming to the end of its operational lifespan and this crucial upgrade work will improve the reliability of this strategically important infrastructure – providing improved journeys for passengers and more capacity for freight.
"The project is progressing well and we look forward to completing our work and fully reopening the line for customers in June."
