The Interrail Pass is a great way to travel by train across Europe. We work together with many railway companies in the 33 countries that are covered by our Pass. Each country has its own national railway and often also some private railways. The Pass covers the trains run by National Railway Companies, and you can find a list of the trains that are included per country on the Train Companies in Europe. Using the app you can find a Rail Network guide available by clicking in =More.
For most trains, you won't need to purchase additional tickets or supplements. However, if you plan to take a high-speed or overnight train, you may be required to make a reservation beforehand. It is always a good idea to check the specific train you plan to take and see if a reservation is required. By doing so, you can avoid any unexpected fees or travel disruptions.