South Western Railway has apologised after reporting that trains to and from Waterloo Station would be delayed after a track circuit failure.
Disruptions to several platforms are expected to continue until noon.
A statement read: "This incident has only just occurred and South Western Railway are obtaining further information and once known, will be made aware to our passengers.
"To reduce the delays to trains, some services may have to be altered or revised at short notice. Some services may also be diverted via an alternative route."
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