Because the world is vertical, traditional roads don't work. The Ribbon-Rail is a cog-driven train track that spirals around the trunk of the tree like a garland.
Main Station: @Ribbon-Rail Central Station
The Sleigh-Trains: The cars look like festive red sleighs fitted with heavy brass wheels.
The Hub: All lines converge at @Tinsel-Town Junction.
The Danger: Sky-Pirates and "Drift-Stalkers" often ambush the trains as they pass the @The Shattered Boughs (East), @The Shattered Boughs (West), trying to detach cargo cars and let them fall into the void.