It's unfortunate, but there's no way to properly signal an X Crossing within the length of a set of big power poles. My definition of "properly" means if trains do not cross paths, they should not slow down.
This intersection is only one tile past the big power poles, but that breaks it's ability to form a perfect grid with the other rail blueprints in my rail book. To fix that I extended the exits, which makes the blueprint 3x the size of a normal rail segment.
I should note I get hung up on aesthetics. I demand my rail blueprints to be symmetrical.
Also, the image is only of the intersection, so you can see the details. The blueprint extends in every direction to the next set of power poles in order to connect properly to the other blueprints in my original rail book.
Image Alblum - Shows rail blocks, and zooms out to show the entire blueprint.