Yes, that was rather lame of Marty to complain about police harrassment and being arrested for getting on the train without a ticket. It would seem rather logical to assume that persons wishing to ride the train would make sure they know where to buy tickets and have their tickets in hand before they just go hopping on train cars, but she always was known to be a ditzy motormouth who was feasibly too busy yapping to actually stop and look for directions. That happened in France, but really country matters not. Buy train ticket before boarding seems like basic common sense to me.