Southern Rail drivers are striking for the third day this week.
Passengers will again face disruptions to their journeys as members of the Aslef union take action against driver-only trains.
Another three-day walkout is planned for later in the month.
Southern Rail passengers should expect more disruption to their journeys today - in spite of drivers returning to work.
Members of the Aslef union have been on strike for 48 hours in protest against driver-only trains.
Southern's owners Govia Thameslink yesterday announced plans to take the union to the Supreme Court.
Commuters will have their journeys disrupted again today as Southern Rail drivers continue to strike.
Hundreds of thousands of passengers were affected yesterday, with another walkout planned for Friday.
The action is part of a dispute over driver-only trains.
Southern Rail are advising passengers to avoid travelling today as drivers begin more strike action.
Trains will be cancelled today, tomorrow and Friday - with severe disruption also expected on Thursday.
The strike is part of an ongoing dispute over Southern's proposals to increase its use of driver-only trains.
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Southern Rail says 82% of Southern services are running to time against the temporary weekday revised timetable introduced today to reduce the impact on passengers and staff of unpredictable and late notice cancellations.
Services are very busy but there are still no reported crowding issues. The temporary timetable has 85% of the normal number of trains.
The changes we made today have, so far, delivered an encouraging start to what we wanted to give our passengers: a more robust timetable with more trains running to schedule at times when people need them the most.
But while we cautiously welcome this news, it is early days and we also realise that what our passengers really want is for us to get back to our normal timetable as quickly as possible.