This puzzle is originally created by by Roger Penrose. The goal is to guide the train all the way to the station via the railways, without ever reversing or taking sharp turns. The train can only travel forwards. For instance, at the first crossing, where five tracks join, it can only take one of the three tracks that go north - it can not go back where it came from, or take the other southwards track.
Which route does the train have to take?
Note: With sharp turns, I mean those turns that a train would not be able to make normally because there is no smooth curve to follow, or in other words: the path the train takes should be differentiable.