A while ago @milkisklim@lemm.ee and I had a discussion on here about dual level rails. There was a problem with them that milkisklim eventually commented their solution to, but I didn't want to go that route. I settled on a single level LHD network for a "skyway" but wanted to find a solution I liked for stacked lines to use for local networks.

It can still be difficult to tell from above which way is which with the railed version, and the trains will clip through the beams a little, but if it works well for me I have tweaks in mind before I use it too much.