We are doing a day trip from Vienna to Budapest in December. We can book the train to Budapest it seems but am having issues booking the return train. The time we want is listed as Ticket Unavailable on both the OBB site and the MAV site. I emailed OBB and got this response:
“For tickets, which are not available in our ticket shop, the booking is necessary via the operated sale.”
I am not sure what this means. Any tips?