I am trying to buy train tickets from Prague to Vienna and then from Vienna to Budapest at website tickets.oebb.at.
I selected route, date (in July, it is valid as it seems). I entered credit card (AmEx) and then got message saying "Payment was not Effected". I am in US.
Why is that? I tried the other website, https://www.cd.cz/eshop, but it seems the price is twice as much as tickets.oebb.at.
Please help.