Network Rail has announced a £60m investment project to replace Clifton Bridge, near Penrith, in 2026.
Engineers are starting preparations on site one year before the major railway bridge is replaced in Cumbria.
The 71-year-old bridge, which takes trains over the M6 between the North of England and Scotland, has reached the end of its life.
Currently, only one train at a time is allowed on the bridge, which causes delays for passengers and freight services.
So workers can carry out the work safely, there will be road and rail closures in January 2026.
To complete the work, engineers need to dismantle the old bridge and take it away on the M6. The new bridge materials will be delivered by road and built on site.
The team has now arrived on site to prepare a compound for the work.
National Highways is working on behalf of Network Rail to build an access road to the work site.
From January 2025 until the end of the project in 2026, there will be traffic management in place on the M6, starting approximately three miles south of Junction 40.
The work will ensure safe and reliable journeys for passengers and freight over this vital 135-metre-long structure for years to come.
Olivia Boland, Network Rail sponsor, said: “We are rebuilding Clifton bridge over the M6 to keep rail passengers and motorway users safe for years to come. This project is essential as the bridge has reached the end of its life.
“The main work, which involves rail and road closures, is not happening until January 2026. However, people living in the Clifton area or driving past might notice the start of our construction activities.
“We’re working with National Highways to make sure we can carry out our work as safely as possible with as little inconvenience to local people and the travelling public. Thank you for your patience during this critical work.”
In January 2026, the railway will be closed for two weeks so the bridge can be demolished and replaced over two weekends. Network Rail is working with train operators to plan what alternative transport options will be available during this time.
The M6 will be closed over two weekends in January 2026. Between the evening of Friday 2 January and the morning of Monday 5 January 2026 and the evening of Friday 9 January and the morning of Monday 12 January, the motorway will be closed in both directions between junction 39 at Shap and junction 40 near Penrith.
Network Rail and National Highways will share plans for diversionary routes as a soon as possible.