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Spacemouse, I solved this on my old layout by using relays and a DPDT on-off-on momentary contact toggle. The leds were used only on the diverging route to simplify wiring. If the led wasn't lit, the route was aligned through. One side of the DPDT went to the switch, the other to the relay. The Leds were garden variety running on 16 v AC for ten years no problem I used a resistor (1K, Off the top, I would have to look it up to be sure). Most of the leds I encountered were not real picky about voltage etc. The other question I would have is: Is it necessary to have indicators for turnouts that you can see? I used this system only on turnouts that were hidden of otherwise inacessable. saved me a lot of time. My two cents,
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