Thanks for those helpful suggestions about the pictures/videos and the avoidance of the picture flashes, and also the concept of repitition by the thieves. I've used that concept before to bust people at my place.

Norm, I won't be doing any booby trapping, and I've read the other threads about trespassers. However, I do like Ric's idea about the bogus can of gas. I need to explore that further.

I do want to stress that I have no problem with CSX. They're more than willing to give me the easement if I ever go through with it.

If anyone has anymore thoughts on what the perps could be doing with these slabs, please post them even if they may be wild ideas.

Thanks guys.

Excerpt from Robert Crais' "The Monkey's Raincoat:"
"She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."