Bobby,
I can't speak to the whereabouts of this particular engine, but in the summer of 2000 I was lucky enough to looking out my office window (overlooking the Rutherford, PA NS yard) when a special train passed by. Just after the locomotive, there were three flat cars. On the first was a locomotive, the second carried a tender, and the third had a coach. I found out after the fact that they were a CP Royal Hudson headed to the West Coast to become part of a static display.
Maybe that was the engine in question.
George