Commuters jump over and crawl under ticket barriers at station last night . Signal problems south of station in London and person was hit by train . Southern Transport Police at scene as Southern Rail reports severe delays . Station has had overcrowding problems since redevelopment work began .
Commuters jump over and crawl under ticket barriers at station last night . Signal problems south of station in London and person was hit by train . British Transport Police at scene as Southern Rail reports severe delays . Station has had overcrowding problems since redevelopment work began .