Major engineering work will affect services throughout the South West Trains area and all passengers should check journey details before travelling.
Some lines between Clapham Junction and Wimbledon will be closed all day Saturday and Sunday. A reduced train service will run in and out of London Waterloo. Many train services will be altered to make best use of the lines which remain open. Other services will have to start or end their journeys at stations away from London Waterloo and passengers may need to change trains.
The lines between Crewkerne and Honiton will be closed all day Saturday and Sunday and replacement bus services will run. No South West Trains services will run west of Exeter St Davids.
The lines between Barnes and Hounslow will be closed all day Sunday. Train services will be diverted via Richmond and Twickenham. Replacement bus services will run between Barnes and Feltham via Brentford and Hounslow.
All lines in the Aldershot area will be closed Sunday until early afternoon. Buses will replace trains between Woking and Alton, also between Ascot and Guildford.