I have bought tickets on line from Vienna to Budapest (using OBB website, by Railway). However, I have not booked a seat because I could take different trains depending of my arrival time to Vienna. So, I may take any train from Vienna to Budapest on 4th october, depending of my arrival time to Vienna, but I have not assigned a seat.
My question is: can I book a seat when I arrive at Vienna train station (Wien Meidling)? What must I do? Is there automatic machines to book the seat? Or I have to ask for it in the tickets office?
Really, is a great problem if I haven´t a seat booked for 4th october? (I think it´s not high season).
