Yes. I was there that day. There was a short inner guard rail across from the starter's stand that was supported by some railroad ties buried on end that were higher than the top of the rail itself by a foot or so.

I don't remember how the whole thing started, but Cliff got launched and landed driver's side down on top of the rail with one of the railroad ties in the cockpit with him.

Everything considered, he was lucky to have gotten out of that crash with no worse injuries than he received.