If the illumination is led, the AC could be problematic over time. Also, many of these switches act like a double throw switch. If in the off position when spanned by pickup rollers over the isolation gap from a powered track they give a direct path to ground. That was a tough troubleshoot for me the first time it happened. If you never forget to have the siding powered when entering it with anything with double pickup rollers, no problem. I just left the ground wire (illumination) off. Also, not sure how DC has frequent polarity changes.
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