Most services in and out of London Euston station have returned to normal following a trackside fire.
Signalling equipment was damaged in the blaze in South Hampstead on Wednesday, temporarily cutting Euston's power supply and leading to its evacuation.
The whole of the West Coast mainline was affected, as far as Liverpool.
London Midland, Virgin and Southern are operating normally but delays continue on the London Overground between Euston and Harrow & Wealdstone.
Emergency generators were brought in to provide temporary power for signals after the fire broke out in north London on Wednesday afternoon.
In a statement, Network Rail said that while services were returning to normal "customers are advised to check before they travel for the latest information on nationalrail.co.uk and with their train operators".
It added: "While our engineers have restored power to Euston, they have yet to replace the 100-metre stretch of fire-destroyed, 11,000-volt cable at South Hampstead.
"They will do this job overnight tonight."
No service is expected on the London Overground between Euston and Harrow & Wealdstone for the remainder of the day.
According to the Office of Rail and Road, the independent regulator, Euston is the fifth busiest station in Britain with 41.7 million entries and exits in 2015/16.