@X7123M3-256 I actually tried to make them into doors, but I couldn't really figure out how that worked. Opening existing door models into the object editor just made it crash, so also couldn't find an example.
i think it was a synonym for: "in real-life" or "in reality".
here from wikipedia:
it goes some distant straight befor the turn. X7 just said, they would fall off in reality.
And no: those files should not be part of the download. oRCT didnt remove them, after i de-selected them. It seems to be bugged sometimes.