Thanks guys for all the replies.
Okay, what I have done seems to work great on my gargraves track. I took a 1/8 diameter 4 inch piece of copper tubing and mounted it on the center of a quarter inch thick by half inch wide piece of Balsa. I mounted the tubing in the center of the Balsa piece and soldered wires together via a plug which will be connected underneath my layout. The Balsa pieces are mounted just touching the outer Center rails of the gargraves track which turns out to be a perfect fit for the unloading car shoes. The tubing is only 4 in Long which will not allow the uncoupling shoe to touch at the same time. I think this works okay. What do you think.