A railway line is blocked due to a points failure.
The railway lines going towards Gatwick Airport via Redhill are blocked as a result.
Train services are delayed by around ten minutes.
There were also delays due to a speed restriction between East Croydon and London Bridge.
These have now been cleared.
A Southern Rail spokeswoman said: "Please check journey planners and allow extra time to travel this morning."
The points failure was resolved at 9.05am.
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