The DiscoverEU Travel App can be used to determine if a particular train or route requires a reservation. Whenever you look up a journey in the Planner, the results will show whether or not a seat reservation is required. If a reservation is required, you will see an orange text saying “Seat reservation required”. It will also show a price indication, so that you can easily decide whether you want to take this option or not. If you travel in summer, we highly recommend you to make your seat reservations as soon as possible.
If you think the price is too expensive, or if seats have already sold out on your train, we encourage you to read this article. Here, we have assembled some useful tips and tricks to avoid trains with seat reservations.