The thing it most basically pulls is a plow, that tool said to have so profoundly advanced human culture.
I wondered then whether anyone (maybe Icelanders) called them "iron oxen" or "power plows" or anything more Germanic. So I started poking around.
|English:|| cart, carriage, wagon (wheeled vehicle; not self-propelled)|
|Italiano:|| vettura, vagone (of train), carro (with animal traction)|
|Esperanto:|| vagono, ĉaro|
That came up, when I tried to see what "tractor" was called in other languages. It's not tractor, but I was excited to see that in Italian, "carro" is something pulled by animal traction (which fit right in, and also gave me a good clue why we called our automobiles "cars." In English a "cart" is pulled by animals, but people didn't so often ride in them as they do "wagons" or "carriages."
Britannica Concise Encycopedia had some cool tractor details:
High-power, low-speed traction vehicle. The two main types are wheeled and continuous-track. Most modern tractors are powered by internal-combustion engines running on gasoline or diesel fuel. Tractors are used in agriculture, construction, and road building, for pulling equipment such as plows and cultivators, for pushing implements such as bulldozers and diggers, and for operating stationary devices such as saws and winches. The first tractors grew out of the steam engines used on farms in the late 19th century; in 1892 an Iowa blacksmith, John Froehlich, built the first farm vehicle powered by a gasoline engine. The tractor revolutionized farming, displacing draft animals and many farm workers. By World War I the tractor inspired the tanks built by the British and French.
Read more: http://www.answers.com/topic/tractor#ixzz1dya3raeO
I saw some steam tractors at an outdoor museum called Hollycombe Steam in the Country last summer.
It was pulling visitors in a wagon like... like... an omnibus !