Interrail allows you travel freely throughout Europe, however some trains require an additional reservation. In general all Suburban Trains and all Regional Trains, where you can just board the train and sit wherever you prefer, do not require any additional reservation. For High-Speed Trains and Night-Trains an additional reservation is almost always required. For Night-Trains a so called sleeping supplement is required. With this you are always sure of your own spot during the night, where you can relax or sleep. When you have an Interrail pass it is required to purchase these mandatory supplements, preferably as far in advance as possible – because these trains can become full! Now when trains are full there are usually plenty of other options available during the day (usually) to get to your next destination, but sometimes a particular connection is simply more convenient. Below you can find a page per participating country with an extremely detailed list of all valid Night-Trains with Interrail; whether they require the purchase of an additional supplement, whether you can purchase an additional supplement in advance and what the costs will be.
Interrail countries with Night-Trains (virtually all Night-Trains require a supplement).
– Czech Republic
– The United Kingdom
Interrail countries without Night-Trains.
– Bosnia and Herzegovina
– The Netherlands