A reservation is usually required for high-speed trains and night trains. By making a reservation you're guaranteed to have a seat or bed on the train. Reservation fees depend upon the train, the class, and the type of accommodation.
The reservation fees for European trains are set by the railway companies and can be found below. Please note that these lists are not exhaustive and can be subject to change. We advise you to make your train reservations 2 months in advance.