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.
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A 24-year-old man has been arrested on suspicion of murder after the body washed up on the Thames shoreline.
Seven people have now been arrested after a man died from serious head injuries
The 38-year-old officer was on his way home from a night shift when he collapsed. His death is not being treated as suspicious.