[2020] Station tracks. How do they work?

It's a special track that's used in asset creation of station buildings. If you aren't making a station asset, then you should just ignore that it exists.

A building would be needed yes, especially since it also needs a spawn marker and internal invisible paths to work. You can use some empty buildings to kinda make your own in game, but depending on what you're looking to make, it might not be completely possible.

Are you looking to make a cargo station or a passenger station?

This one works for cargo stations. There's also a harbor one.

https://steamcommunity.com/sharedfiles/filedetails/?id=527544869&searchtext=template