Hello, all. I've got a functioning Arduino/Motorshield combo running JMRI. I am in no way an expert in this, having watched a tutorial on how to load and compile the software on the arduino. An annoyance: If I want to program in a new decoder, or read from an existing decoder, I must be on the programming circuit. If I want to POM and run the loco, etc, its the other circuit. I know this is by design. My issue is that I can't have both plugged into the single test track that I use at home. I know that using JMRI with a PR3 or 4 allows you to have a single set of conductors connected to a test track. Switching between programing and POM is accomplished by powering off the track in JMRI, switching from one to the other and then powering back on. With my current setup (no pun intended!) if I run both sets of wires in a Y harness for positive and negative each, I can't turn on track power. The board detects a fault and turns off the power. I thought of perhaps running a diode on one leg of the harness, but I'm not sure how the communication between the decoder and the command station works and I don't really want to break anything. Anyone else seeing this and/or have an idea on how to address short of having a zillion toggle switches to isolate the two circuits or having to run two tracks? Thanks!