Sam’s tractor repair has been working on this Cat Tread as long as the railroad has been here.  The story was told that his son, took the dozer out for a joy ride and started dozing up the desert.  A rock got caught up in the track and snapped it apart.  So dear Ol’ dad has to come to fix it.  This has been on the layout since the start, but only now, 2022, have I updated the truck with some tools.