South West Trains are now running a normal service between Wimbledon and London Waterloo, and between Dorking and London Waterloo, following earlier emergency engineering work.
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Six people were injured after they were hit with the substance during an "altercation" between two groups at a shopping in east London.
Save Your Uber in London was set up after it was announced the firm would not have its licence renewed when it expires next week.
Survivors are still traumatised, homeless and want answers.