Southern said that it would operate a revised timetable if the company’s train drivers go ahead with a proposed overtime ban from next Thursday (29 June).
The company said: “Southern Railway plans to operate a revised timetable that would give passengers more reliable services if drivers belonging to the union ASLEF begin an overtime ban on Thursday 29 June.
“The rail firm plans to operate 75 per cent of its weekday services on Thursday 29 June and Friday 30 June and is working to improve on this number from Monday 3 July.
“This will create a timetable with stability and consistency. Passengers are advised to expect a reduced service on certain routes and to allow extra time for their journeys.
“More information is being published at www.southernrailway.com/dispute.
“Online journey planners will be updated next week.”
Southern passenger services director Angie Doll said: “This action is going to be very inconvenient to our passengers and communities but by putting in this revised timetable we will be able to run a more reliable and consistent service.
“We’ve been safely running our trains with drivers closing the doors on additional routes since January and have had six months of sustained improvement in service levels and positive passenger feedback.
“We urge ASLEF to put an end to their industrial action and allow passengers to get on with their lives.”
The company, part of Govia Thameslink Railway (GTR), said: “Passenger numbers have doubled in 12 years on Southern routes into London making the Southern network the most congested in the country by far.
“Southern says it has to transform and modernise the way it does things to manage capacity and keep people moving.
“Thameslink services are not directly affected by the industrial action although these services are expected to be extremely busy.”
Among the changes, there will be no off-peak Gatwick Express service between Gatwick Airport and Brighton although the company hopes to run a limited peak service.