An emergency incident is causing delays on the line between London Waterloo and Portsmouth.
South Western Railway are warning customers that the disruption could last until 3pm today (November 14).
All lines between Putney and Feltham in South London have been blocked – which will affect trains from Portsmouth to London Waterloo and vice versa.
National Rail said: ‘The emergency services are dealing with an incident between Putney and Feltham resulting in all lines being blocked.
‘Train services running through these stations may be cancelled, delayed or revised. Disruption is expected until 15:00.'
SWR added: ‘UPDATE 14/11* SWR tickets will be accepted on
‘- TfL bus between Staines, Sunbury, Surbiton & Wtrloo
‘- Underground by any reasonable route
‘- GWR between Reading, Windsor & Paddington and Reading, Basingstoke, & Guildford.
‘- Replacement buses between Feltham and Barnes.’