A train has partially derailed in south-west London leaving one person with minor injuries and causing significant disruption.
Emergency services attended the "low-speed partial derailment" of a South Western Railway train early on Monday morning in the Wimbledon area near East Putney, National Rail said.
British Transport Police (BTP) warned of "significant disruption", tweeting: "Officers are attending a low-speed partial derailment of a train in the Wimbledon area. One person sustained minor injuries."
Trains between Wimbledon and London Waterloo are affected, with passengers advised they can use tickets on Transport for London (TfL) buses.
National Rail expects disruption to last until the end of the day.
The derailment also halted District line trains between Parsons Green and Wimbledon.
Meanwhile, further delays to the London Underground network were caused by a power failure which wiped out the entire Bakerloo line.
No trains were running between Queen's Park and Piccadilly Circus, while services elsewhere on the line later resumed.
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