Several train companies are warning of delays and cancellations if the huge storm forecast to hit London and the South East is as severe as expected.
Falling trees, flooding and damage to buildings and equipment all risk disruption to services on Monday.
South West Trains are sending engineers to hot spots to protect equipment and buildings and extra staff are being deployed to help in key locations.
The company say the lines between Weymouth and Basingstoke via Southampton and Portsmouth and Guildford are most at risk.
Southeastern Trains say they'll have teams in place across the network to clear fallen trees and repair damaged equipment to keep services moving.
First Capital Connect warn that revised timetables and short notice changes are possible.
Greater Anglia trains are telling passengers with advance tickets booked for Monday can be used for travel tomorrow.