We are sorry to passengers for the ongoing serious disruption on the South Western Railway network today.
Our engineers have now fixed the signal fault and all lines have reopened.
However, passengers should expect significant disruption through the day as we work hard with South Western Railway to recover the train service.
Passengers are urged to follow the travel advice issued by South Western Railway and should check journeys before travelling at southwesternrailway.com or National Rail Enquiries.
Passengers should also note that an amended timetable is in place today due to RMT union industrial action.
Network Rail would like to thank passengers for their continued patience as work continues to return the service to normal.