I had a David O King catalog in the first part of the 1970's. For me it was a wish book, I wanted some of them, but there was no way I could afford them.
A couple of years ago I picked up an NOS pair of David O King interurban trucks in a Walthers box (Along with a Walthers interurban kit). Both trucks powered. Off the top of my head, I don't remember how power gets from the motor to the wheels sets. I do remember that the two wheel sets are connected via chain drive, using a plastic Grandt Line chain.
Funny thing, the chain drive interferes with the collector roller. I don't see how the trucks could be run.