Passengers travelling on trains between Clapham Junction and London Waterloo are advised expect delays and disruption until 10pm.
A train has hit an object on the track which means that a train line towards Waterloo has been blocked.
Trains between Waterloo and Salisbury/Exeter will only run between Basingstoke and Salisbury/Exeter.
Southwestern Rail staff at both stations will also be able to advise passengers who may need to travel via a different route.
For more information please visit the Southwestern Rail website.
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