train numbers have changed

You do not have a ticket for RJX 11562, you have a ticket for Vienna to your destination (you are not saying where). Tickets are by default for a route. Tickets with train binding lose it when a train gets cancelled or a schedule is changed. That the train has a long number seems to indicate that when you booked the schedule was already temporary. The normal number of that train is RJX162. When a schedule is temporary modified because of eg. engineering works the number often gets replaced with a special one.

So you now have a flexible ticket.

(Note, if you buy tickets half a year in advance this often happens. The railways haven't fully realised yet that people in fact do buy tickets that far ahead).

Your reservation will probably not work. ÖBB should replace it for a new one without extra charge, but easiest is probably to just cancel your existing reservation, and get a new one. The Austrians refund a reservation 100% up to 15 days before departure, so you are well within that period.

Thank you. The destination is Salzburg. The RJX no is 11562 and the new one RJX 13162. I think your advice of cancelling the tickets and rebooking them will probably be the easiest in the long run. Unfortunately, I can’t read what is written on the tickets as I don’t understand German. The times and dates, yes, but that is it.

Unfortunately, I can’t read what is written on the tickets as I don’t understand German. The times and dates, yes, but that is it.

Use Google Translate?

No don't cancel the ticket, just make a new stand alone reservation on train 13162. The existing ticket itself will still be valid on the train, as it is the same time train just a different number.
Train 13162 is from Bratislava to Zurich.

OBB are still confirming the timetables for mid December onwards so the train number and the train cars may yet change again.

Now, I am a bit confused. If I make another new stand alone reservation, I will be paying twice for the same route, Vienna to Salzburg, irrespective of the train number. Perhaps I should hold off until December, otherwise as suggested, the train numbers might change again. I have booked with OBB in the past and have never experienced any problems until now.

..just make a new stand alone reservation on train 13162.

isn31c did mean to make a new seat reservation only, not to book the ticket again. Seat reservations and ticket purchasing are two different entities as far as ÖBB is concerned (different for other train operators).

I have booked with OBB in the past and have never experienced any problems until now.

It is always advisable not to book tickets based on a tentative train time table. A respective warning is given during the booking procedure.

As every year, on the second Sunday of December there is the coordinated time table change of all European train operators.

Just buy new seat assignments. Maybe 3 euro each.

Exactly like Mr. E says - they are 3 euro. Just buy a new reservation in February or early March.

Thank you everyone for your advice as I was a bit stressed out about it. Will keep the current tickets, but as suggested will buy new seat reservations when finalised time table is released in December and perhaps download the OBB as well. This forum is a great help.