Waterloo Station has been hit with travel chaos after a trespass incident forced scores of trains to be cancelled.
South Western Railway and Thameslink services have been hit with major disruption expected until the end of the day.
All lines through Wimbledon were blocked as emergency services responded to the scene. The lines have since reopened.
Rush hour services on South Western Railway from London Waterloo have been hard hit, with commuters being told to get taxis instead of trying to board affected trains.
Thameslink services between St Albans and Sutton are also severely disrupted.
