Post edited 5:40PM – Jun-18-09 by Glenn
I don’t have a proven, scholarly source of German etymological information. But less formal sources (more than a few) say this:
It comes from World War 1 soldiers. The train station represented the way home after their service was complete. So whenever they couldn’t understand some order (presumably over the radio) they would say, hopefully, that all they understood was “train station.”
Soon the expression came to mean either that you CAN’T understand what you heard, or you don’t WANT to understand what you heard.
It reminds me of Hogan’s Heroes, but that is set a whole war later.
Can someone confirm or refute this etymology?