Thousands of train passengers could face severe delays until the end of the week - after "extensive" damage to overhead power cables.
The problems at Radlett in Hertfordshire mean services run by three train companies - Southeastern, East Midlands Trains and First Capital Connect (FCC) - are likely to be affected throughout today.
People could be delayed by up to an hour as there's major disruption expected on services between Luton and St Pancras International in London.
More top news
A teenager has been arrested after a mass bomb hoax closed hundreds of schools across the UK.
The Metropolitan Police have confirmed the charge following his arrest on Sunday. He will appear at Wimbledon Magistrates’ Court on April 4.
Declan Donnelly will host the show alone when the show returns on March 31 following his partner Ant McPartlin's return to rehab, ITV says.