Rail services on the west coast main line which runs through Motherwell will be disrupted for the next few weeks due to storm damage on the route.
Engineers are carrying out repairs to the Lamington Viaduct, just outside Lockerbie, after it was damaged by Storm Frank.
One pier of the structure has been weakened and investigations into the full extent of the damage will continue until the end of next week.
The viaduct is expected to be closed until the end of January with Motherwell passengers needing to travel into Glasgow to cross the border or use a replacement bus service.
Phil Verster, managing director of Network Rail Scotland, said: “Our engineers have been working round the clock for the past few days to try and gain access to the viaduct so we can understand the scale of the damage that has been caused by Storm Frank.
“While that assessment work is not yet fully complete, it is clear now that the damage is significant.
“We are already working on solutions as to how we get the viaduct fixed and allow us to safely run trains over it again.
“However, it is likely that it will take us to the end of January until we can reopen it. If we can get it opened earlier, then of course we will. However, customers should plan for the work to continue until the end of the month.”
A limited service is operating between Carlisle and Glasgow Central via a diversionary route which will add 90 minutes to the journey time.
Buses will run between Carlisle and Glasgow Central for passengers who wish to travel to and from Motherwell and Lockerbie.