Rail site for train travel from Prague to Vienna?
 

I will be traveling from Prague to Vienna by train in april. Can anyone give me a site to purchase tickets? Do you need to purchase in advance or just go to train station?
I will also be traveling by train from Vienna to Budapest? site for that also?
Thank you.

Several years ago I was in Prague and we went to Bratislava - via train. When planning the trip people on Fodors recommended that I purchase my train tickets in Prague at a travel agency Cedok. I tried to see if I still had the address in my notes but I don't...I am sure you can google or someone here will know. Anyway, it was very easy and much better than going to the train station. And we had no problem getting reservations for three people (it was on the train that was going to Budapest).

Just go to the train station and buy a ticket. Think we went the day before just to check out the station and where it was and buy the tickets. cheaper and no problems.

http://jizdnirady.idnes.cz/vlakyautobusy/spojeni/
have a look at this site,I have used it quite often fro travel within the Czech republic,but itr also gives times of trains to Vienna.
Can't help with the other part of the trip.

Go to https://eshop.cd.cz/, the Czech Railways online ticket shop.

If you book ahead, you can get Prague-Vienna tickets from just 19 euros including seat reservation, and you simply print out your own ticket.

On the day (or the day before) at the station, it'll be more like 50 euros.

on the day 36 euros