South Western Railway said due to the failure of the equipment, it could not “use platforms 1 to 14 at this time, significantly limiting capacity”.
The company has apologised for the disruption and told customers to check for updates, while National Rail has also warned that “major disruption is expected until the end of the day”.
SWR said trains across its network “will be subject to cancellations, platform changes and major service alteration”.
Tickets for disrupted services will be accepted at no additional cost on CrossCountry services between Reading and Bournemouth, Southern trains between Victoria, Portsmouth Harbour and Southampton Central, and Great Western Railway journeys between Salisbury, Westbury and Weymouth.
Commuters can also use their tickets on London bus routes between Waterloo and Zone 6 areas, as well as some Falcon Buses, Stagecoach and Morebus services.
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