Sorry - But even in english - I have zero Idea what it does or how. Looks like it has a purpose... Just do not know what that is.

English Translation via DeepL:

"I couldn't see the blueprints for the conversion station in the station, so I made my own. It allows for top and bottom stacking, with inbound and outbound shipments marked with light tags. The node links for shipping from the top to the bottom are lightly noted in the screenshot above."