Brian, Thank you for the response. Yes, I am aware of the need to
install a bridge. I had no idea these motor mounted trucks were
so common. I have never seem them on anything but an RS-3.
Here is a video of the Slinky Dog that someone else had done
first and posted. The rear truck has pickups so the doggie has
a blinking red light on his tail. I wire the track to a momentary
switch (5" button) and kids can get the dog to extend and retract.
It is a big hit at public events I volunteer at. Realism,not so much.