I want to know can I travel from dusseldorf to UK by train for 1 day only I only have valid Schengen visa.
If yes, what would be the procedure
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Citizens of India need a visa to visit the UK. https://www.gov.uk/check-uk-visa/y/india/tourism/no
There isn't any exception if you only visit for one day, or if you come by train, or if you already have a Schengen visa. None of that is relevant. You would need a visa.