credit card use- train stations

I don't know about credit cards, but you can easily use your ATM card to obtain cash. I try to reserve credit cards for rental cars, gas stations, hotels and restaurants.

Val, there should be something in the fine print about whether a chip-and-PIN card is required...I can't check, because I don't know who you bought (or want to buy) your tickets from.

Thanks, guess I have more fine print to read! Guess it seems safer to allow the extra time.

Well, what fun trying to sort out the bureaucratic mindset of Eastern Europe. My browsing here https://jegyvasarlas.mav-start.hu/eTicketV2/EN/gyik.html#Atvetel which you probably saw when making your on-line purchase offers lots of answers but not about chip-and-pin cards (the clip comes from your bank's fees.) In Europe, maybe these cards are taken for granted. Anyhow the rail system suggests you can print your tickets at home. A great alternative, if it works. It also suggests that e-ticket machines were an initial installation before home printing but without explaining how they coughed up pre-purchased tickets. It is persuasive to see how many FYIs have to do with those e-ticket machines not coughing up anything. The Man in Seat 61, who has been everywhere, says this about Keleti: "The domestic ticket office is downstairs off the end of platforms 6-9, although there's also a small office upstairs on platform 9. The international ticket office is separate, accessed through a signed passageway a little way along platform 6. You'll usually find staff who speak reasonable English, and credit cards and euros are accepted."
http://www.seat61.com/Hungary.htm Scroll well down. Kelati is a magnificent pile from the outside but rather gloomy and a bit ramshackle inside; try to be there during daylight hours. Or you might try e-mailing your question at the system Internet site I mentioned above.