Casey, I have nothing but speculation and questions with a few observations. In the Ron Harr Collection there is a very early plow train photo with a plow that does not have a cabin. Is it the same plow as seen later? I wonder how they deployed the spreader wings? Air,steam or brute strength? Did the plow also have a flanger underneath? Seems like I have seen this feature on the later photos, but not sure? 2nd, the AFE's show a 2nd SVRy snow plow #2 built late using a Cat grader wedge plow blade. I wonder if OLC borrowed this one as I seem to recall seeing OLC #7 shoving one like this.