An image showing parted cables hanging down close to the ground near Carstairs in South Lanarkshire was shared on social media by Network Rail at about 6.45pm on Friday.
Network Rail say they are working with providers to divert services to and from Edinburgh via Shotts.
Engineers have confirmed the southbound track is safe and will be allowing northbound services to cross over and use the line, and avoid the problem, but delays on the West Coast Mainline are still expected.
⚡️ We're responding to reports of damage to the overhead power lines near Carstairs on the West Coast Mainline.
This will affect cross-border @AvantiWestCoast @TPEassist & @CrossCountryUK services as well as @ScotRail trains to and from Lanark.
— Network Rail Scotland (@NetworkRailSCOT) May 20, 2022
They tweeted: “We’re responding to reports of damage to the overhead power lines near Carstairs on the West Coast Mainline.
“This will affect cross-border Avanti West Coast, TransPennine Express, Cross Country and ScotRail services to and from Lanark.
“Our engineers have confirmed that the southbound line in the Carstairs area is safe and available for use.
“In order to get trains on the move, we’ll also allow some northbound trains to crossover and use this line to avoid the problem. However, it will still mean delays.”