• E56 from Regensburg via Passau to Linz, Upper Austria.
• Motorway A23 to Villach, Carinthia.
• E54 via Brenner to Innsbruck, Tyrol.
• E652 to Villach,Carinthia.
• E57 via Spielfeld to Graz, Styria.
Austria has plenty of connections with all its neighbors daily. Every neighboring country (even Lichtenstein) have trains at least hourly. Many (Czech Republic, Hungary, Germany, Slovakia, Switzerland) even more frequently. The ÖBB (Austrian Railways) operate high-speed ICE and RailJet trains from cities like Zurich, Munich,Frankfurt, Passau, and Budapest. Eurocity trains are the next fastest trains available as well as the trains connecting the bigger Austrian cities called Intercity. Regional trains called EURegio and simply Regionalzug are also avialible from all 8 of Austria's neighbors.
Vienna is a the largest railroad hub but day and night trains from most Central European countries travel to many stops across Austria. Day trains are normally much quicker than night trains. Tickets can be purchased from certain locations to Austria via the ÖBB website. Always compare fares from the departure or even transit countries' railways as there may be price difference even for the same train. ÖBB offers discount 'SparSchiene' tickets to and from destinations like Croatia, Denmark, Germany, Italy, Netherlands, Poland, Serbia, and Switzerland for a flat-rate (i.e. €29 for a one-way seater, €39 for a couchette, or €59 for a sleeper). There are a limited number of tickets at this price. At peak times you need to book in advance. Additional offers are avaible to all countries in Central Europe, although many cannot be booked online