That Düsseldorf "SkyTrain", same as the Dortmund H-Bahn! Only with rounded edges on the cars.
Speaking of Dortmund, this is not really about trains, but trams are on-topic enough I think. For a glimpse into the rather grey past (well, it's dated end of December 1991) of this town, have a video of a tram going the full length of the line from the southwest of town to the northeast:
The tram line, along with others in town, has been modernized/replaced by a "Stadtbahn" system which runs underground in the city centre. But essentially, it still follows the same way.