Ed,
I followed the Atlas O instructions and have four target blocks triggered by the same isolated rails across my Atlas O Single Pratt bridge. When the engine gets onto a point five inches into the bridge (I cut the isolated rail with a right angle Dremel saw) the isolated rail trips four target signals to red. When the sections of track are vacated, the automatic feature of the Target signals four control boards turns the four individually yellow, then green again. I have four wired to the same isolated rail sections. One on each side of my double crossover. The targets work from either direction.
In the last pictures you can see that I put a communication cable between/starting at the target and running to a G-Signal, so when the Target turns red, the G Signal turns Yellow. The G-Signal is independent the other way, as it approaches the Interlock at the bridge and runs on the automatic timing. It works. Call me lucky.
The isolated rails also trip targets on each of the parallel tracks crossing the interlock the other way. Isolated rails, with each control board connected to them, running in automatic mode. (No plug-in connecting cables)
Good luck.
Sincerely, John Rowlen
