InterRailInterRail /ˈɪntəreɪl $ -tər-/ adjective, verb [intransitive] trademark 
an InterRail pass allows you to travel around several European countries. People often talk about students ‘going interrailing’ (=travelling using this pass): 
We spent three weeks InterRailing around Europe.
an InterRail pass allows you to travel around several European countries. People often talk about students ‘going interrailing’ (=travelling using this pass): We spent three weeks InterRailing around Europe.