Train services running through Mitcham Junction towards central London currently delayed due to a fault.
Journey's are being extended by up to 20 minutes or diverted via West Croydon while a signalling fault between Sutton and Mitcham Eastfields is investigated.
The disruption is expected to continue until 8pm.
Services running from Epsom and Sutton to Victoria, and from Sutton to St Albans may divert via West Croydon.
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