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The first sixteen days of the work focused primarily on completing the south junction: installing and upgrading the track, signalling and overhead line equipment to enable passenger and freight services to connect to Edinburgh and to add an additional diversionary route for services to Glasgow.
The closure of Carstairs junction impacts on cross-border operators including Avanti West Coast, Caledonian Sleeper, CrossCountry Trains and TransPennine Express, which are operating via diversionary routes or offering alternative journey options during this time.
Services operating on the East Coast main line during this time are also likely to be busier than normal.
Passengers are advised to check with National Rail Enquiries or with their train operator for the alternative travel plans for their route.
During the first phase of the project, between
Saturday March 4 and Sunday March 19, there are no direct services to Glasgow Central or Edinburgh on the West Coast main line through Carstairs.
Phase two of the work, taking place between
Monday March 20 and Friday April 21, will see part of the junction re-opening, allowing some trains to run directly to Edinburgh and via diversion routes to Glasgow.
On weekdays, however, journey times will be longer than normal.
The final phase, between
Saturday April 22 and Sunday June 4, will see most services return to normal during weekdays.
The junction will be fully closed each weekend with no direct services between Glasgow Central or Edinburgh and Carlisle on the West Coast main line.
There will be no ScotRail services to or from Carstairs for the full three-month period.
ScotRail will run a range of alternative journey options throughout with Carstairs station re-opening on Tuesday May 30.
Carstairs Junction sits 26 miles south-east of Glasgow on the West Coast main line. Currently, the junction requires regular maintenance work as much of the infrastructure through the area is reaching the end of its operational lifespan.
Speed restrictions are often imposed, which can affect performance.
The layout of the junction is no longer suited to today's pattern and volumes of service with over two hundred services passing through the junction on an average midweek day.
Enabling works for the project have been underway since 2020 and the work delivered during the line closure will see over two hundred engineers working to upgrade the junction.
The new power supply being installed will allow engineers to switch off the overhead lines remotely to carry out maintenance, reducing the amount of time the railway is closed in future.
The improvements will also bring reduced overall journey times through the removal of a 50mph speed restriction.