I'm not really familiar with all the BB variations. Simply there is/was Lionel and MTH, scale or not scale. That's four variations right there, the not scale being lower cost. Which of these variations would minimize the overhang on 088 track? My outside mainline is 096 and there would be interferences. But my adjacent mainline is 088 and looks like it might tolerate an overhang. Truth be known, I would rather have a cab forward.