This is due to engineering work and will affect trains on Sunday (November 30) only.
Trains will run as normal on Saturday (November 29).
We have broken down the details for you to plan ahead this weekend.
Sunday (November 30):
Engineering work is taking place between Shepherds Bush and Wembley Central, closing all lines used by Southern services.
No Southern trains will run between Clapham Junction and Watford Junction.
Trains will also not run between Gatwick Airport and Three Bridges, Brighton via Burgess Hill, or between Three Bridges and Horsham.
Trains between London Victoria and Brighton and between London Victoria and Portsmouth Harbour will run to an amended timetable, running non-stop between Clapham Junction and Horsham.
These trains will not call at East Croydon.
Trains to and from Brighton will also call additionally at Horsham, Littlehampton, Angmering, Worthing, Shoreham-by-Sea and Hove.
