Train passengers have been facing delays travelling between London and Hertfordshire after damage to overhead power lines.
More than half a mile of cables collapsed at Radlett, causing problems on First Capital Connect, East Midlands and Southeastern services.
Paul Brand reports.
EAST MIDLANDS TRAINS
All lines are now open to East Midlands Train Services which don't use the overhead power lines, but there may be delays of up to one hour on services between St Pancras International and Nottingham, between St Pancras International and Sheffield and between St Pancras International and Corby.
FIRST CAPITAL CONNECT
Two lines remain closed to First Capital Connect Thameslink, so a revised service is running, with delays of up to an hour and some cancellations. Disruption is expected to continue for the rest of the day.
Services between Bedford and Brighton, Luton and Sutton and between Kentish Town and Sevenoaks are affected.
SOUTHEASTERN
Two lines remain closed to Southeastern trains, causing delays of up to an hour and some cancellations.
Services between Bedford and Brighton, Luton and Sutton and between Kentish Town and Sevenoaks are affected.
Source: INRIX
This picture, taken by passenger Martin Stewart, shows the broken cable hanging over the track in Radlett station yesterday.
Severe delays have been predicted on Southeastern, East Midlands Trains and First Capital Connect until the end of the week.
Passengers have described how they were evacuated from a train, after overhead cables came down in Hertfordshire yesterday.
The First Capital Connect service came to a halt just outside Radlett. And, after a two-hour wait, passengers were forced to walk down the line to the station.
One of those on board, Martin Stewart, said that there were "lots of sparks when the cable hit the train".
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.