With only one exception, these can be placed directly on top of each other by lining up the power poles. One of the rail signals on the Right 45 conflicts with the Chain Signal on the Y Right.
They're a 3-wide rail system (6 tiles between the rails), so they won't line up with 2-wide systems.
The U Turn blueprints have a dead-end installed to prevent you from accidentally flying past the entire turn when you are returning to the end of the line. Holding right upon approach will skip the dead end to allow you to maintain momentum.
Imgur Album: https://imgur.com/a/cZA1S
Inspired by Kitch's Blueprints: https://youtu.be/9VxkBkrX0nU
Addon: X Crossing. Sometimes an X Crossing is necessary... but it has some problems I've detailed within its description.