Speaking of WS2812 3-color LED controller IC's, RR-CirKits offers an LCC-based signal controller for their "Simple Serial?Signal Bus" that controls signal LEDs using these inexpensive IC's!
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Even if signals & switch controllers were wireless, you'd still have to wire power to them.
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And while controlling track switches via the DCC track bus, using stationary decoders, simplifies and saves wiring, running a train against such a switch would short out both the track and the means by which to rectify the problem from the throttle/panel.
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-- Andy
