>I have an Oyster card that I got when I was in London in 2007 -- I don't recall whether it was >explicitly a "Visitor" Oyster card. Is it likely to still work? Probably. You can set up an online account on the TfL website, register your card to it. It'll tell you what your balance is, and you can top up from a credit card. As I recall, online topups with US plastic works. If it demands a UK address, use your hotel's. https://account.tfl.gov.uk/oyster R's, John