Delays of up to onehour on Southern between Brighton and Victoria, between Horsham and Victoria,between Eastbourne and Victoria and between East Grinstead and Victoria due toearlier fire alert at a signalling box at Three Bridges.
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A survey found 50% of people were in favour of charging drivers based on how much they drive.
Police said they are "extremely concerned" for the welfare of a "vulnerable" mother and her two children who have gone missing in Bexley.
It is hoped the 7,400-mile journey will become a cost-efficient and time-saving way of transporting trade between China and the UK.