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.