The driver was were friendly and explained the working principle, which was once common but now unique in Europe. Like all funicular railways, the two cars are connected by a cable, and weight of the descending car pulls the ascending car up the hill. To make sure that the upper car always weighs more than the lower one, each car has a tank that connects to the city sewer. They fill the car when it is at the top station and empty it at the bottom. The systems uses zero energy, but does give the lower terminal a certain "fragrance".
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