But Southern has promised to run more trains than it has in previous strikes if next week’s action goes ahead.
Nearly all of the train operator's 156 stations will have either a train or bus service "of some description" if the strikes go ahead, and many routes will have trains running later in the day than on previous occasions.
Southern said there will still be a restricted service next week if the strike happens, with many routes having fewer trains, and some routes having no trains, but buses in the peak.