Tractors were a form of machinery commonly used for agriculture and transportation by farmers.
History
A hallucinatory tractor almost ran Mike Yates and Sarah Jane Smith off the road. (TV: Planet of the Spiders)
The Eighth Doctor drove a tractor that he and Kala had stolen through buildings and anything else that happened to be in their way. The Doctor declared he had always wanted to drive one. (PROSE: Eater of Wasps)
Jack Harkness drove a tractor through the wall of an house in the village of Brynblaidd in order to save the rest of his team. (TV: Countrycide)