Cable-stayed bridge support the bridge deck. Unlike other cable-stayed types, this bridge exerts considerable overturning force upon its foundation and the spar must resist the bending caused by the cables, as the cable forces are not balanced by opposing cables. The spar of this particular bridge forms the gnomon of a large garden sundial. Related bridges by the architect Santiago Calatrava include the Puente de la Mujer (2001), Sundial Bridge (2004), Chords Bridge (2008), and Assut de l'Or Bridge (2008). Cable-stayed bridges with more than three spans involve significantly more challenging designs than do 2-span or 3-span structures. In a 2-span or
Dresden Suspension Railway the other being the much more conventional Dresden Cable Car. Both lines are operated by the Dresdner Verkehrsbetriebe AG, who also operate the city's tram, bus and ferry networks. Specific General Dresden Suspension Railway The Dresden Suspension Railway () is one of the oldest suspension railways — a kind of hanging monorail — in the world, having opened in 1901. It is situated in Dresden, Germany, and connects the districts of Loschwitz and Oberloschwitz (Rochwitz side). The line is long and is supported on 33 pillars. It was designed by Eugen Langen, who earlier designed the Wuppertal Suspension Railway, a