I used to think that Mars lights looked great on Baldwin sharks. They used to come snarling through my home town on the PRR main line, hauling enormous coal drags, Mars lights gyrating and horns blaring as they approached the crossing.
I thought only the first two Pennsy BP-20's had mars lights.
I'm not aware any RF-16's, Pennsy or otherwise, that had Mars lights installed.
Rusty
After so many years, I can't answer your questions. I just know that they had the distinctive Baldwin sharknose styling, they were hauling coal and they had Mars lights. I confess, I don't know what models they were. At age eleven, I thought I was pretty hot stuff just knowing they were Baldwins.