Here is couple of Pictures to show where your going to get that Ruled tagged for use in that Session.
Launch your Route in Edit Form (Surveyor Mode)
Second Icon (looks like Piece of Paper and Pencil) has Edit Route, Edit Session, Edit Environment, Edit Effect Layers Options.
Select Edit Session.

Top corner of your Screen find Edit Session and this next screen should open up for you.

Should look something like this........Then hit the ADD key at bottom here. New Screen pops open.........
Then just type Junction or first 3 letters of it. You'll see the Name of the Rule pop up. Junction Derailment Prevention.
Once done, go click Check Marks to close and activate your Changes.
I'm a very visual person, so I learn quicker by Pictures than by Text.........Hope this helps you out to see what your looking at,,,,,,,,,