Hi Ned and all others,
That is a neat video, thanks for sharing the find.
From 6:34 to 7:14 we get to see two Cats pulling a truck up a hill. I had to look a couple time to figure out the reason for the iron beams along side the second Cat. The beams for a yoke so that the first Cat pulls on the truck and not on the second Cat.
I am not sure I would like to be the fellows following behind the truck carrying the wood blocks. I suspect their job is to block the wheels of the truck if something fails and prevent the truck from rolling down the hill.
Thanks again for sharing,
Jerry Christiansen