An electricity supply problem between Raynes Park and Motspur park has led to South West Trains being delayed and cancelled.
Trains between Wimbledon, Epsom and Chessington South are being delayed by up to 20 minutes and some had to be cancelled as engineers worked on the problem.
The supply problem was fixed by 7:30am but trains have continued to be delayed for morning commuters.
Trains have had to be amended while services attempt to return to normal.
Disruption is expected to continue until approximately 8.45am.
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