A points failure is causing peak hour delays for Sutton commuters this morning.
The failure is between Sutton and Streatham has resulted in the line via Wimbledon being blocked.
Southern and Thameslink trains between Sutton and Streatham may be cancelled, delayed or diverted via Mitcham Junction, National Rail has said.
Disruption is expected until 9am.
National Rail added that passengers may be entitled to compensation if you experience a delay in completing your journey today. "Please keep your train ticket and make a note of your journey, as both will be required to support any claim," the message read.
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