The train on the left is heading into an (under construction) underground section
There are also some leftovers from a crashed monorail train (no monorails were harmed here, it’s built from regular parts).
On the other end the trains are heading into (modified) winter-village.
In between there are some areas that aren’t built yet but there’s quite some space left.
Also I’m a little surprised that shelves hold it up that well :D (they are bolted to a substantial brick wall tho).
It’s based on the Friends Heartlake Cupcake Café (41119), I replaced the pink pieces with red and white ones and added the upper windows to fit the station on top.
The station in Ninjago city was the very first thing I added :).