This picture is from a children's book called "Ich will Lokführer werden" or I want to be a Train Driver. This book has all of the normal things you would expect; how trains and tickets work, what the different parts of a train are called, how fun trains are... (Is this a Deutsche Bahn marketing book?)
Until we hit this page....
Yes Baby Bird...the train driver is peeing out of the window. And no, you can't pee out of a train window.
Since Mr. Linky has gone to HTML heaven, please submit your photos in the comments and I will link them above.