Converting a model railroad layout to DCC using the Digitrax Zephyr Express, with install and initial operation. UPDATE: The situation with the plug in the back of the unit has been resolved. I suspected that it should be removable, but could not get it off with significant effort. There was nothing in the manual about it, so I initially left it alone, out of fear of causing damage. After filming, I decided to have another go, and I was able to finally remove it with pliers and a screwdriver...way too tight from the factory without any mention of it in the documentation. All good in the end.