Below is a summary of the work planned for this weekend. Please check nearer the time for confirmation and more details.
The lines between Salisbury and Warminster will be closed all day Saturday and Sunday. There will be no South West Trains service between Salisbury and Bristol Temple Meads. Passengers use replacement bus services between Salisbury and Warminster, then First Great Western train services.
The lines between Bournemouth and Poole will be closed all day Sunday. Replacement bus services will run.
All lines in the Richmond and Twickenham area will be closed all day Sunday. Replacement bus services will run between Barnes and Hounslow via Richmond and Twickenham, also between Barnes and Teddington.
All lines in the Havant area will be closed Sunday until mid-day. Buses will replace trains between Petersfield and Portsmouth Harbour. The lines between Fareham and Portsmouth Harbour will remain open.