I have small ez-track oval with a totally black terminal section and an unpowered switch on one of the straight sides. Power is provided by a Digitrax Zephyr. The track reads 13 volts everywhere. The terminal track is all black vs. the model Model: 44510, which has short gray sections at opposite ends. (I have no idea what the difference between the two is, other than appearance.) The issue is that my DCC 4-4-0 with Digitrax sdxn136ps sound decoder stops dead on the terminal track. It runs perfectly on the rest of the oval. Does anyone have an idea of what may be wrong or what I might check next?