Yes, i was in the train when we stopped on lonely train station and there was girl, boy and cameramen apparently shooting a porn. The train stopped and camera guy was recording us in the train :-) After few years, I find out the found scene with me reading a newspaper in that train. The scene is at the bottom of first page here:
http://www.publicplacepussy.com/
How did I found it? Saw another scene with couple fucking in the front of pub located 300m from my home....so I was thinking that must be it and it was. I even bought the membership to that site to find me there. My first and last performence in porn movie :-)