Updated with train signals. My trains drive on the left, swap signals accordingly if you want to drive on the right.

Spiral rail intersection over the large hole in the center of the map, with 5 off-ramps along geographic contours, and also spirals downward in case you want to build something in the hole (will personally be the site of a future quantum component factory, coming soon).

Given the unique geography this rail intersection is built in, this blueprint should be placed in the original location. However, it should be easy to copy and paste sections to other locations.