Oyster is a smartcard which can hold pay as you go credit, Travelcard and Bus & Tram Pass season tickets. Use it to travel on bus, Tube, tram, DLR, London Overground, TfL Rail, Emirates Air Line, River Bus services and most National Rail services in London.
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If you keep your Oyster card in your wallet/purse with your bank cards, you might occasionally see a red light when you touch it on a card reader at stations and on buses. The red light means you haven't paid for your journey and if you're at a ticket gate, it might not open. This can happen even if you've got enough pay as you go credit, a valid Travelcard or Bus & Tram Pass on your Oyster card because you could be experiencing 'card clash'.
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