What are the modes of transportation between European tourist countries?

It depends on which countries, and whether to go out by yourself or with a group. If you are an individual, you can try to use high-speed rail or plane. If there are many people in the team, you can consider taking a bus, because European countries and countries are not big, and pulling a car is also a good choice, which can save costs. High-speed rail generally runs from west to east, but Austria will not have it. Further east, it is similar to the domestic green leather train. Uncomfortable and safe, there is the possibility of thieves. Therefore, if there are few people, Eastern European countries such as the Balkans simply fly directly, and the air ticket is generally 1000-2000 RMB/person (including tax). Western Europe, the Netherlands, France and Germany all have their own high-speed rail operations, which are very convenient. If Germany, Austria and Hungary have the Danube, they can also design routes and consider taking a boat. Finally, I suggest that if you have a long life, you might as well consider pulling carts, and then Western Europe can experience a high-speed train and Eastern Europe can experience a boat, which is better.