Smoke was spotted billowing out of a train, causing disruption to holidaymakers trying to get to Gatwick Airport.
Southern has received reports of a fire on an empty train at Clapham Junction, with railway lines between Balham and London Victoria currently blocked.
A spokesman said: ‘Following reports of smoke from an empty Southeastern train travelling to a depot, engineers attended and identified the cause as a brake fault.
‘The issue has been resolved, the train has moved safely and all lines have reopened.’
The incident disrupted Southern and Gatwick Express services between Balham and London Victoria.
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There have been no reports of any injuries.
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