Hi Pennsy Fan,
Thanks for info! (I should have mentioned the D-63 layout in my question.) Thanks for posting the links to all the videos. I imagine that O scale die cast cars with AAA battery operated LED headlights would be a great effect on that moving highway. I guess a heavy chain could handle the weight. Those light-weight plastic cars would put much less stress on the mechanism as compared to several die cast vehicles.
Take care, Joe.