London Bridge signal failure hits trains from South East
A major signal failure at London Bridge caused severe disruption for morning commuters trying to reach central London from Kent and the South East.
Trains to London Victoria, Charing Cross and Cannon Street were affected.
These services have now largely returned to normal, according to Southeastern trains.
Southeastern apologised, saying it had been caused by "a complete loss of signalling".
The signal started working again at 10:00 GMT, but delays continued throughout the day, particularly on the line between New Cross and London Bridge.
Commuters who were delayed by more than half an hour can claim compensation.
The general secretary of the RMT union blamed the problem on a "toxic mix of massive overcrowding and infrastructure failures".
A Network Rail spokesperson said: "We apologise for the delays passengers experienced this morning on the line through London Bridge to Charing Cross and Cannon Street."