Thousands of Londoners are likely to face severe train delays until the end of the week following "extensive" damage to overhead power cables.
The problems at Radlett in Hertfordshire have affected the services of three train companies in the capital.
Paul Brand has been speaking to Mick Cash from the RMT union and to passengers affected by the delays.
More top news
A man has died after being attacked outside Bethnal Green tube station in front of horrified onlookers
A number of teenagers playing the popular phone game have been targeted by armed robbers in a London park
The victims were playing the popular game in Whittington Park in Holloway on Tuesday night, when three males suspects approached them.