North Downs Line passengers will have to become accustomed to using rail replacement buses over the next few weekends and the Easter break.
Network Rail has preparatory work to do at Guildford before a major possession at the station over Easter, commencing on Good Friday and continuing for 10 days until April 19th. Signalling and points systems are being upgraded, over 1 mile of track is being replaced.
During the period April 10 -19 GWR will be running a rail replacement bus service between North Camp and Gatwick Airport but using a revised timetable, please see the following :-
Services will also be affected at weekends pre and post the Easter possession, the above link also provides all the information you need.