I use these little motors with a 12v supply. I forget the ratio, they are about 120 rpm after going through the plastic 1/1 ratio gears in the Headstock" so I'm guessing ether 100 or 200 rpm motors. I wind up with the lay, (I have a changeover wire connector if needed), keeping the ropes apart with the dolly at the far end. I let the end "tailstock" slide along to between 10-12%, stop the first motor then switch on the final motor and "walk" the dolly back up to the start.
The motor connectors are just the brass bits inside plastic connector blocks