This American programme is perhaps the most detailed account on DVD of just one tractor. But it is a special machine: the Big Bud 16V-747 built in 1977. The biggest tractor built in the twentieth century.

Owners Randy and Robert Williams give guided tours of their machine, show it working with their 80ft cultivator and invite us inside the cab.

Builder Ron Harmon talks about the machine’s history.

The programme includes plenty of information and spectacular filming of the machine’s Montana home.