So simply connecting DIN #1 to DIN #2 is triggering both signals to turn RED.
In which case this has nothing to do with using an ITAD or insulated-rail triggering. It's a question of how to simultaneously trigger two (or more) Atlas signals "in parallel" so to speak. More info is needed on how the DIN input works; it stands to reason this configuration was considered when the Atlas signal system was designed.
If no one comes forward with the "secret" to DIN operation, one brute-force option would be to have the ITAD(s) trigger a double-pole relay (about $10 for a DPDT relay module). The double-poles would isolate the two DIN input when the signals are meant to be yellow/green...but then connect both DINs to the outer-rail when triggered. Or, if in your quest, you come across the schematic of the board that sits in the shed perhaps the circuitry around the DIN input would suggest an even simpler method.
