I've shot plenty of train pictures in various European countries and so far I've only experienced problems in Marseille this summer. I was asked to stop taking pictures by a gentleman with a somewhat official suit and a walkie-talkie. My lack of French at that point made it smarter to follow the instructions rather than ask him what the exact problems were. In both Germany and Switzerland no one even came to ask what I was doing while taking pictures. Especially Switzerland with all the different railroads and rolling stock is a country where you might end up with a small group of people all shooting the same trains.
