Train services are subject to severe disruptions due to an electrical fault.
The fault was reported on the line between West Croydon and Selhurst but trains going through the area are subject to sudden cancellations and delays.
Passengers have been advised some trains are no longer stopping at West Croydon and to use buses to complete their journeys into the area.
Travellers affected will be allowed to use their train tickets on alternative means of transport over reasonable routes.
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