This is just one specific line on a particularly steep hillside in Stuttgart therefore it has been built as a rack railway. It's known as the "Zacke" (German for tooth or prong) though officially it's just "U10"

There are two cars, going up and down at the same time, theres a station in the middle where they pass each other.

The stops are long enough to take your bike off of the bike cart. It isn't a particularly fast tram anyways. It also doesn't run at night because it runs extremely close to houses and it's comparatively loud.

It's a bit of an oddity because it's part of the normal public transport network and included in your ticket. There are only 3 other rack railways in Germany and those have been built purely for tourism and have their own fares.