Winter timetable started on Sunday 13 December

Several Southern routes, including East Grinstead to London Victoria, Seaford to Brighton and Brighton to Portsmouth Harbour have seen an earlier start to weekday services. Southern have also responded to greater demand for Saturday services by increasing services on the Brighton to Lewes, Brighton to West Worthing, Sutton to London Victoria and London Victoria to London Bridge via Crystal Palace routes.

To support these changes, the frequency on some routes have reduced for a few hours during the middle of the day when trains are quieter. For example, between 12:00 and 15:00, the frequency of trains between London Victoria and Eastbourne have changed from half-hourly to hourly, before returning to half-hourly at busier times.