@NoDoxGregBrady @jb @BrazilianContrarian It could be a "tractor pull" tractor. They hook up to a big weighted sled system then take off like a dragster. A big concrete block will be moved forward on the sled as you go down the dirt track making it harder & harder to pull until you stop. Best distance and time wins. When I was a kid guys would use surplus warbird aircraft engines in them. I remember seeing one with three WWII era radial engines mounted in series. Loud beyond description!