National Rail has warned of delays in and out of London Bridge station due to an electricity failure.
The rail operator said trains may be cancelled or delayed by up to 30 minutes as two platforms, 14 and 15, are blocked. Southern Rail and Thameslink services are affected.
"Engineers are currently working to fix a problem with the third rail power supply at London Bridge, which is affecting one of six platforms used by Southern and Thameslink services," said Andy Derbyshire, Network Rail's chief operating officer in the south east.
"We're sorry for any disruption this causes passengeres, but our team are doing everything they can to resolve this issue as quickly and safely as possible."
National Rail said disruption is expected to last until 8pm:
National Rail said the following train service alterations will be in place:
- London Bridge to Horsham (and vice versa) will run as per timetable
- London Bridge to Brighton services will be cancelled
- London Bridge to Eastbourne services will be cancelled
- London Bridge to Bognor Regis services will be cancelled
- London Bridge to Littlehampton services will be cancelled
Tickets will be accepted on the following routes below at no extra cost:
- London Underground via any reasonable route
- South West Trains services from London Waterloo to Clapham Junction
- Southeastern Railway services via any reasonable route
The rail operator also advised that customers can travel from London Victoria and London Blackfriars on Southern and Thameslink Railway.