What does a travel card cover in London?

Related questions

1. Can I return Oyster card to Heathrow?
2. What are the zones in London?
3. Can I use Oyster on TfL rail?
4. What zones are covered by a Travelcard?
5. Can you give your Oyster card back?
6. Is Walton on Thames in Oyster zone?
7. What is Oyster card in London?
8. How much is Oyster card deposit?
9. Can I use Oyster card on national rail?
10. What is a TfL travel charge?

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6. #allows
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8. #often
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10. #single
11. #overground
12. #which
13. #valid
14. #national
15. #paper
16. #services