The occupancy detector circuits sense the voltage drop across diodes to indicate the presence of a train. For the track sections that are not on occupancy detectors there would be a higher voltage present because of no diodes in the circuit. Not good. The train would speed up when it enters a section without occupancy detection. To remedy this all sections of track must have diodes in the power supply line feeding them. I made dropper circuits just for this purpose. Design, expose, etch, cut, drill, solder. All in one evening. I like quick projects like this!
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