There really isn't a truly "unsafe" voltage. Generally, I like to keep the track voltage somewhere close to 18 volts as I run Legacy/TMCC and DCS. However, DCS runs pretty good down to 12-13 volts on the track as long as there's sufficient current available. The other constraint is TMCC/Legacy doesn't want to see more than 19 volts on the track, DCS around 22 volts.
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