A signalling fault means trains from London Waterloo are disrupted on Thursday morning as commuters may face delays.
A fault between London Waterloo and Vauxhall means that some lines towards Clapham Junction are blocked.
Engineers are at the scene to fix the issue. Disruption is expected until 11am, according to National Rail.
Trains running between London Waterloo and Clapham Junction may be delayed or revised because of the error.
A spokesperson for South Western Railway said: “Engineers are on site, however we don’t know when the fault will be fixed.
“Until further notice no service will be calling at Queenstown Road in both directions.”
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