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
Wednesday's Pollen Forecast
Thousands of troops could be sent out to protect key sites and events after the Manchester attack. Here's everything you need to know.
Wednesday's weather for the west of the region