Commuters in large parts of the UK have been hit with severe travel disruption after a fire shut down one of London's busiest train stations.
Trains in and out of Euston station were cancelled and passengers evacuated on Wednesday afternoon after a power cut caused by a blaze next to the track near South Hampstead.
Other parts of the country are affected, with the hub - the fifth busiest station in Britain - used by Midland, Virgin and Southern trains.
Network Rail said services may not be back to normal until Thursday morning.
It said: "Train customers are impacted in London and the length of the West Coast Main Line, including Birmingham, Manchester and Liverpool.
"Network Rail engineers are trying to get some trains moving this evening on the West Coast Main Line by using emergency generators to restore temporary power to signals.
"Engineers are preparing to work through the night to install 100 metres of 11,000-volt power cables with the aim of getting services back to normal tomorrow morning."
A Virgin Trains spokesman said: "Tickets will be accepted for travel (on Thursday) or a full refund offered. Alternative routes are available but customers are urged to check their journey before travelling."
Affected passengers are being advised to visit nationalrail.co.uk for updates on the situation, or contact train operators.