Well, if you are interested in photographing the infrastructure of the railroad, there is a good chance that your going to get reported by the passing trains and crews. There is soild evidence that many terrorists have pictures of railroads, stations, trains, buildings, and its also documented that they like to scope out the locations they plan on attacking by taking current, up to date photographs of the location, to see if anything has been changed and probably for a sick before and after collage they do or something.
Now, you might feel that if they have the pics already, whats teh difference, they already have them. But they don't have CURRENT pics. They NEED current pics adn videos to make sure that everything they planned for will still work and that nothing has changed between wehn they were there last and the time when they are ready to commit the act.
As for the taking of anyone's picture.....you need to respect the privacy of people. I do my job out in the open, but im not thrilled when people take my picture, and especially if the media is involved and taking pics of trains loading and unloading, etc, etc, etc. The company don't like that either, and we are not to make statements to the press, or be interviewed or anything like that, because then we become a spokesman for the company, and they have people for that.
I understand photographing is a hobby, but there are things you just cant do in your hobby in these times. You have to control yourself and use common sense. I konw it sucks, but Im in the same boat. My hobby is riding sportbike motorcycles. I LOVE to go triple digit speeds, but I CAN'T (not to say that I don't every once in a while
) but I have to refrain and control myself, so I don't get myself and others in trouble.
Just use common sense. Think as if you are outside of your body looking at your actions. You know they are innocent, but would someone who doesn't know you think they are???