Oyster pay as you go - Transport for London
Oyster cards. An Oyster card is a smart card that you add money to, so you can pay as you go. You can pay as you go to travel on bus, Tube, tram, DLR, London Overground, most TfL Rail, Emirates Air Line and Thames Clippers River Bus services. You can also travel on most National Rail services in London and some outside London.
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