Train passengers are being warned to prepare for major travel disruption on Sunday because all lines in and out of London Euston are closed.
There will be no services to or from the station on Sunday morning until at least midday due to emergency repairs on downed overhead wires, Network Rail said.
Trains operated by Virgin, London Midlands and London Overground will be affected and delays are expected throughout the day.
But the station will remain open despite the line closures.
More than 500m of wires near Wembley, north London, needed replacing after they were damaged at around 3.30pm on Friday.
The cause of the damage is not yet known.
Passengers are urged to check before they travel on Sunday.
A statement on Network Rail’s website said: ‘At around 3:30pm Friday afternoon the overhead wires that provide electrical power to trains were damaged in the Wembley area.
‘Over 500m of overhead wires now need replacing and our engineers have been on site since the incident occurred, working to repair the damage as quickly as possible.
‘To complete this significant job, all lines out of London Euston will have to be closed Sunday morning.
‘Passengers traveling on the West Coast main line in and out of Euston will be affected by delays as the timetable is amended.
‘The cause of the incident is not known at this stage
‘Services travelling from the north towards London Euston will also be affected – please check National Rail Enquiries.
‘The London Underground tube station at Euston is unaffected and will be open as normal.’