Unless you understand Czech. you first will want to click the British Flag icon on top of the page for an English translation. For a Prague to Vienna train ticket you need to type Praha hl.n. for the departure train station, and Wien Hbf for the arrival destination. Once you type them out they will appear in the box below what you typed. Click the box to confirm these two train stations which are Prague and Vienna’s main train stations. Enter the date and time of travel. Click “Connection and Ticket” and “Continue.”
The trains departing after the time you selected will be listed. When you decide on the train you want, click “Purchase a Ticket “ in the small blue letters below that particular train’s listing.
Pick the class of ticket you want, select “ticket w/ a possible reservation” and whether you require a return ticket. You also need to select your age category (Czech train tickets are discounted up to 50% for those 65 and over), if you have a discount card, if personal iD will be used to confirm you are the ticketed passenger. Your personal ID will be your passport. Be certain that you enter your name exactly as it is written on your passport before buying your ticket. Then enter your credit card number, CVV code ( the three digits on the signature side of the card). Click “Pay” and you should receive a confirmation e-mail and then another e-mail with your train ticket and its QR code. That is what you will show to the train conductor when asked to present your ticket.
Occasionally, train tickets for travel beyond December 10 and June 2023 will not be released for sale until the official train timetables are released around December 10 and June 10. That doesn’t seem to be the case for now, In reality, train timetables in the Czech Republic and throughout the EU have very few changes between them.