Well it appears, out of the suggestions, I have a two options. I went to Bachmann's website. While they DO sell shells for the U33C, unfortunately, they are OUT of PRR and Santa Fe. Those would have been my first choices. And some of the ones they do carry, the railroad never used the U33C...like the New Haven. A shame, that's a nice color scheme. They also don't have the Erie Lackawanna. That would have been an excellent choice, as I have quite a few of those. Western Pacific was another nice choice, but again, that railroad never used the U33C.
I think what I might do, is buy Brunswick Green paint from E-Bay and just repaint it in PRR colors myself. The PRR decals and lettering are available on E-Bay too. Doesn't have to be a fancy-dancy paint job like a Lionel or MTH. Just something that would be "correct" for what the loco is. Might even give it a "weathered" look. 
