The largest grader ever built was the one-of-a-kind monster built by Italian contractor Umberto Acco in 1980, for use on a major contract in Libya. Its 33-foot blade, front and rear engines totaling 1,700hp and running on 12 large tires, ensured the ACCO overshadowed everything else built to date in the grader field. Its estimated weight was around 400,000 pounds! But this grader hardly qualifies for the grader ‘hall of fame’ because the job for which it was designed never materialized and, as far as we know, the machine never actually accomplished any productive work.