I was visiting Hamburg ~30 years ago - spoke no German. Bought a ticket from a machine and boarded the train. A couple of stops later some heavily armed polic

I was visiting Hamburg ~30 years ago - spoke no German. Bought a ticket from a machine and boarded the train. A couple of stops later some heavily armed police were checking tickets on the train and I found out the hard way that I had purchased a 2nd class ticket but I was sitting in 1st class. Luckily once they saw my US passport they forgave my ignorance and ushered me along without a citation (or something worse).