It's a possibility that there isn't one, but... there IS one on the front (although with the train line on the wrong side).
How I wish I could just go look at the damn thing!
Also worth noting on this girl: even though she was built in 1895, she was still running in the 30s with an industrial concern, with whom the PRR swapped her for an 0-6-0. She also has been moved around on her own wheels for display by the PRR and then the PC after that, so theoretically, it should be a functional piece of equipment.
It really IS perplexing though!!
I guess the good news is that, for now, at least, I can get away without adding one myself.