Rather than add to the other thread started by Nestor re this issue when trying to buy a train ticket online and being stymied by the need for a 3D Secure password, I did try calling Capital One, who confirmed they could see the attempted transaction but that it didn't go through, and they know nothing about being able to set up a 3D Secure password, kept blathering on about the 3 digit code on the card, so not helpful at all. My Citi card wouldn't work, either.
I have 2 questions now:
The other option is pay by bank transfer, is this safe?
Or, can I just buy my ticket in person at the station on the day of travel, or a couple of days ahead? I am travelling from Vienna to Budapest on Friday, April 28 and hoped to take the 8:39 am train, is it likely to sell out?