Originally Posted by
mtkeller
I had a friend here in November, and he had no problems using his non-chip Visa from the US in ticket machines. The AmEx vs. Visa/MC thing immediately suggests that you didn't call your card issuers in advance so they'd authorize your card abroad. This is not a problem with AmEx.
I've never gotten my US Amex to work in a tube machine that took credit cards, including on my last trip about a month ago.
So some folks are just lucky, I guess!