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Passengers on some of the busiest rail routes across the South are being warned not to travel on Monday morning because of over-running engineering works.
No South Western Railway trains were running between Surbiton and London Waterloo - the UK's busiest railway station.
It is the latest disruption to hit SWR following a spate of problems involving signal and points failures.
A long-running dispute over the role of guards on trains has also crippled services because of strikes.
Normally-packed commuter trains were cancelled, leaving tens of thousands of passengers stranded.
Some passengers took to social media to vent their anger.
Stephen Hicks, who works at the University of Southampton shared a picture of all the cancellations in and out of London Waterloo station on Monday morning.
Southern services between East Croydon and London Victoria were also disrupted because of over-running engineering works.
The Rail, Maritime and Transport (RMT) union called for the resignation of Transport Secretary Chris Grayling because of the latest bout of travel chaos.
Our reporter Richard Slee, has been out to some of the South's train stations.