Berlin still has them! https://www.youtube.com/watch?v=dxYiz4knmkU
https://en.wikipedia.org/wiki/Elevated_railway#/media/File:R...
Whereas that line in Berlin looks like it's on a viaduct. Lines on viaducts are all over the place, including in London:
https://en.wikipedia.org/wiki/London_Bridge_%E2%80%93_Greenw...
As in Berlin, and i'm sure everywhere, the arches get used as commercial or industrial premises. We have a particular fetish for putting craft breweries in them:
https://www.beervanablog.com/beervana/2019/9/12/Londons-rail...
Parts of the BMT from this article still exist, but mostly aligned to and from Manhattan rather than across the borough itself.
I wonder why this system https://en.m.wikipedia.org/wiki/Wuppertal_Suspension_Railway has been used only once worldwide.