Based on your comments I assume that you have a TIU or Explorer. Make sure they are unplugged before trying run conventionally. Because of the age of your PS2 locomotive, it, probably, has the 5 volt board. These boards are at the end of their life and will to be replaced at some point. Mine lived for 18 years before it simply would not run again. That fact that yours is still responding to DCS signals is good.
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