>>1335967>It's a temporary system that is meant to be turned into a fully fledged metro somewhere in the futureThat's never going to happen anywhere though, and you know it.
>>1336094>>1336108The prototypical LRT uses predominantly grade-separated and independet ROW. The average Stadtbahn is just a tram with underground sections.
Stuttgart has only 26 kilometers of routes underground out of 131 total (~20%). Hannover has 37.2 kilometers underground out of 245.5 km total (15.2%). It looks even worse in Frankfurt and in the Pott, where a distinction is made between "U-Bahn" and trams. In both cases, even the underground system runs overground and on the street for most of the route length.
My point is that it makes more sense to think of Stadtbahn as a light rail/tram hybrid, not a light rail/metro hybrid. And even if a system or its lines in the German-speaking countries are referred to as "U-Bahn", there is a higher chance it's just a tram with some grade-separated sections rather than an actual metro.