“Truck and Tractor pulling, also known as power pulling, is a motorsport competition, popular in America, Europe (especially in the Netherlands), Australia and Brazil, which requires modified tractors to pull a heavy sledge (sled) along a 35 ft wide and length of 100 meter or 300 ft+ track, with the winner being the tractor that pulls the sledge farthest. The sport is known as the world's most powerful motorsport, due to the multi-engined modified tractor pullers.

All tractors in their respective classes pull a set weight in the sledge. When a tractor gets to the end of the 100 metre (300 feet) track this is known as a “full pull”. When more than one tractor completes the course, more weight is added to the sledge, and those competitors that went past 300 feet will have a pull-off; the winner is the one who can pull the sledge the farthest.

The sledge is known as a weight transfer sled. This means that as it is pulled down the track, the weight is transferred (linked with gears to the sledge’s wheels) from over the rear axles and towards the front of the sledge. In front of the rear wheels, there is a “pan”. This is essentially a metal plate and as the weight moves over this the resistance builds. The further the tractor pulls the sledge, the harder it gets.

The most powerful tractors, such as those in the 4.5 modified class in Europe, can produce over 10,000 bhp”. – Wikipedia

A driver competes in his tractor during the Tractor Pulling Euro Championships in the western German town of Fuechtorf September 9, 2012. Eighty teams from across Europe participated in the two-day competition where high-powered tractor prototypes must pull a trailer down a 100-metre (328 ft) track as far as possible. (Photo by Ina Fassbender/Reuters)

A driver blocks his ears during the Tractor Pulling Euro Championships in the western German town of Fuechtorf September 9, 2012. (Photo by Ina Fassbender/Reuters)

A mechanic checks a tractor motor during the Tractor Pulling Euro Championships in the western German town of Fuechtorf September 9, 2012. (Photo by Ina Fassbender/Reuters)

A driver competes in his tractor during the Tractor Pulling Euro Championships in the western German town of Fuechtorf September 9, 2012. (Photo by Ina Fassbender/Reuters)

A driver competes in his tractor during the Tractor Pulling Euro Championships in the western German town of Fuechtorf September 9, 2012. (Photo by Ina Fassbender/Reuters)

A driver competes in his tractor during the Tractor Pulling Euro Championships in the western German town of Fuechtorf September 9, 2012. (Photo by Ina Fassbender/Reuters)

A driver competes in his tractor during the Tractor Pulling Euro Championships in the western German town of Fuechtorf September 9, 2012. (Photo by Ina Fassbender/Reuters)

A driver competes in his tractor during the Tractor Pulling Euro Championships in the western German town of Fuechtorf September 9, 2012. (Photo by Ina Fassbender/Reuters)

A driver competes in his tractor during the Tractor Pulling Euro Championships in the western German town of Fuechtorf September 9, 2012. (Photo by Ina Fassbender/Reuters)

A driver competes in his tractor during the Tractor Pulling Euro Championships in the western German town of Fuechtorf September 9, 2012. (Photo by Ina Fassbender/Reuters)