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That's the one! Suspended railways of this kind almost never make sense compared to conventional designs, but in the narrow confines of the steep valley that Wuppertal lies within and is presumably named after, the only space available for mass transit was above the river Wupper.
Pretty sure Ninjago City just has one because it looks cool.
This one?
https://en.m.wikipedia.org/wiki/Wuppertal_Schwebebahn