[sapper740]

Here's a couple of pics of a gasoline powered R4 "pylon" queen at Carswell AFB near Ft. Worth taken by Bob Pettit in 2006 and posted on Olive drab.com. Carswell AFB was the scene of Jimmy Stewart's movie "Strategic Air Command". Both B36's and B47's were flown out of Carswell back in the day. I saw this dozer every Drill weekend when I was a member of the Texas State Guard. Hope these help.