Never really been on many trains before but going interrailing - 5 travel days in 10 days - with two friends (also 16 years old) across Europe this summer through France, Germany, Austria and Italy. For all except one of the trains, we'll be going overnight, and it seems very tempting to just book a seat reservation as opposed to the more expensive couchettes (sleeper compartments being waaay out of our budget of £600 each!). Obviously, due to our age, our main concern with seats would be security rather than comfort, but is there anything actually wrong with them?