I was going to say that in the Harry Potter films they went one better with a triple decker bus but seriously, I've never heard of this railbus. However, if you decide to go to Germany and you're anywhere near Dusseldorf I'd recommend a trip to Wuppertal to travel on the unique (yes, I believe it is unique in the world) Schwebebahn. It's a train suspended from an overhead rail and I've never seen anything else like it in my life.
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