Double Decker system, lower deck for road vehicles, upper deck for trains. Still a ton of work to do, but I really enjoy the result so far. I only have the one screenshot now, and some progress pics while I worked on the blueprints (not the finalized design), but I'm on mobile, maybe I'll share some more later.
Edit: Adding linked screenshots! These are all on my test configuration while working in the blueprinter.
This is probably my biggest pet peeve about the game. You can only finagle corners by glitching foundations into each other. Just feels horrible. There are many tutorials about in on YT.