Southern Rail are reminding people there is disruption to some services this week, including between Worthing and Brighton.
The routes affected are between London Victoria / Brighton and Worthing / West Worthing / Littlehampton / Portsmouth Harbour
Engineering work is taking place between Brighton and Littlehampton, closing all lines overnight from Monday evening until Friday morning.
From 23:30 until the end of service each night, buses replace trains between Brighton and Worthing. Trains that usually run between London Victoria and Worthing will be diverted to run between London Victoria and Brighton.
Passengers are being asked to plan their journeys.