Grandpuf
After phone discussions with the site owner, a few other knowledgeable PRR people, and 2 months of research, I found that about all of the information available on this crane was contained on that page link that I posted above. There are quite a few unanswered questions about the car. I made a few suppositions when I designed the model including the location of the batteries and resistor banks . How they functioned I think is lost to time. I hope I am wrong about that.
I also made some educated guesses about the booms and their relationship to the winches. Not at all straight forward compared to most cranes.
Alan