What is it ? How to use this parts of train ? (real purpose)


Good Question. I've seen theese Parts in the Past too, but I have never thougt about it. I think, I phone some friends in Berlin and ask them for it.ooo @ 11 Feb 2014, 11:53 hat geschrieben:Sorry, ich spreche Englisch.
What is it ? How to use this parts of train ? (real purpose)
http://i.imgur.com/IqK9rpq.jpg
http://i.imgur.com/ONQOZrY.jpg