Lou Kovach's designs for the TPC operated PS1 without problems (or at least without the problems caused by solid state power supplies like the Lionel MW, Powermaster, MRC packs, etc.). The TPC's features were, I believe, built into the Legacy Powermaster, which should operate PS1 without the problems of the 1994 Powermaster. Haven't tried it myself as I no longer have any PS1 locos, but that's the story as it evolved.
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