LEDs and railroad electronics is certainly simpler than, say, cold fusion. But it is rewarding in itself to both use and (later, perhaps0 understand what is happening. A light emitting diode is an electronic device that permits current to flow in only one direction (a diode) that gives off light (visible, or , or ultraviolet). The draw very little current and produce several colors. They use very little voltage as well. Too much voltage will blow them out quicker than hurricane blows out a candle.
They have a lot of uses in model railroading in ALL scales.
