London day trip Travelcard or Oyster?

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If you are eligible for a railcard, contactless will charge full fare.  Oyster cards can be linked to railcards to discount the fares.  You need to to ask staff by tickert machines to do this for you.

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A child on a contactless debit/credit card will pay full fare. If you get an oyster at an underground station the staff can add child visitor to it for half price fares.