My only experience of mainline (not metro) train travel in Europe was into Barcelona Sants, which has automatic ticket barriers so it is not only Britain that has barriers.
Had Clarence boarded a train without a valid ticket in other countries he may have been very heavily fined or even kicked off the train en-route,possibly causing him to miss his flight (I witnessed this on my return trip from Barcelona where the ticket checker made use of his baton!).
I think Clarence would prefer the ticket barriers
Haven't been to Barcelona before, will be there next month though. Will post again if barriers are there. Spain, I think, is curious in actually having a different track gauge to the rest of Europe. I'd be interested to know if anyone can confirm this.
Meanwhile, Ethel's on the train to Scarborough, to visit her sister Hilda. Scarborough's a nice place, lovely sea air. Ethel's really old, though. She can actually remember the Titanic sinking when it happened. So she's hoping that Hilda will have brought her son, and Ethel's nephew, Horace, along, to help with her exteremely heavy luggage, as she doesn't want to be lugging it up the steps on her own. She's hoping Scarborough station doesn't have barriers, so Horace can meet her on the platform....