After waaaaay too long, I finally made up my mind to terminate my mainline at each end with a staging loop. Now, after having to pull out considerable risers and sub-roadbed, I''ve just about finished laying the track on the back half of the staging loop. (built the rear 1/2 "off site" to make it much easier) Knowing this area will be out of sight, I'm wanting to install occupancy detection as I go. I'm running DCC and I know about most of the options. The layout is in N scale and is pretty well tied into doing the SP's Cascade sub. With the mandatory searchlight signals not being available any longer, I don't know whether I need to bother with the voltage-drop systems out there. I'm expecting a line of maybe 18 LED's displaying the occupancy of the 4 staging tracks. I'm thinking an IR system would be good enough. I find circuit designs all over, but I'm hoping for a PCB already available and ready to go. Can any of you advise me where I might find such a thing please?