The RMT BEEP always had two motors with direct drive to the wheels.
I'm confused about the three-four cars, they must be hard-rolling cars! Here's a BEEP with NO traction tires and 7 ounces of added weight, it's pulling 13 cars with no problem starting at all. I removed the wheelset with the traction tire to give this more reliability over the switches, and truthfully, I don't miss the traction tire at all.