There was travel misery for tens of thousands of commuters as three days of strike action on Southern Rail began this morning (11 October).
The strike is set to continue on some of the routes until Friday morning, as the dispute between Southern Rail and the RMT continues.
Southern Rail said it will continue to run 61% of its full service, but there will be a restricted service on many routes, and on some there will be no service at all.
The RMT has held a series of walkouts since April in a dispute over the role of guards on Southern services.
Commuters took to social media to vent their frustration.
The RMT said it received a legal challenge just hours before the scheduled walkout, but said the strike would continue as it examined the details of the challenge.
Another 11 days of strikes are planned before Christmas.
Train services have also been delayed and cancelled between Brighton and Gatwick Airport via Balcombe due to over running Network Rail engineering routes
Southern, which runs commuter routes linking parts of Kent, Surrey, Sussex and Hampshire with London, is introducing a driver-only operation and wants conductors to accept new on-board supervisor positions.