English: Disc harrowing near Peaks Downs, 3 km from Baydon, Wiltshire, Great Britain. The tractor has been fitted with tracks rather like those found on tanks and Caterpillar tractors, although these appear to be retro-fitted to a standard farm vehicle. This is perhaps because the drag from the disc harrow would be too much for normal tractor tyres to handle. The engine is operating hard as can be seen from the heat distortion caused by the exhaust gases.