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.
London''s £60 million cable car across the Thames reaches a crucial milestone this weekend.
Less than a year after work started, the cables are being hung from the new towers between Greenwich and Silvertown.36 Gondolas have arrived from Switzerland and Transport for London is promising a launch sometime this summer.