There are many thousands of trains every day across Europe which do not require reservations.

There are entire countries where most if not all internal trains do not require reservations, such as UK, Germany, Austria, Switzerland, Netherlands. As well as many others where only some trains require reservations and most places can be reached on alternative trains.

There are really only a handful of countries that are difficult to navigate without reservations, in particular Spain, France and Italy.

It’s easy to avoid compulsory reservations on most routes. I travel thousands of miles each year and rarely pay them. You may need to be creative when planning. The planner has a useful no reservations tab but always double check on the carriers site! Experts on this site can often help but we need full details 

Ach mein lieber doch: sogar Ihre nicht immer so ganz pünktliche DB, auf bahn.de or .com, kannst dir auf seine site jans jut zeigen wo mann RES machen muss oder nicht. Es ist eher so das jenau alle diese jungs auf ihre 1er fahrt jenau die strecken abdüsen wollen die so schwer zu kriegen sind. Seit also mehr kreativ und meidet die-du kannst dort besser hin wenn du einmal in die rente bist und geld satt hast.