There is disruption on First Capital Connect between Bedford and Brighton, between Luton and Sutton and between Kentish Town and Sevenoaks due to overhead line problems at Radlett. Tickets being accepted on Southern, London Midland, London Underground and local bus services.
Two lines remain closed to First Capital Connect Thameslink, so a revised service is running, with delays of up to an hour and cancellations. Disruption is expected all day today. Also affecting Southeastern and East Midlands Trains.
More top news
Sunny this evening, then dry overnight. There is the risk of thundery showers for Kent tomorrow morning, then sunny spells by the afternoon
Sunshine to end the day then dry tonight. Tomorrow will be mostly dry and feeling fresher with the risk of a heavy shower in the afternoon
The video, obtained by ITV News, shows scores of migrants desperately trying to board lorries in a restricted area within the tunnel.