A tractor greatly increases the family’s productivity on the farm. It is useful for working the land as well as moving heavy loads. Each tractor gives a bonus of +80% to the outcome of all crops harvested. The bonus is cumulative with other tool bonuses and can be seen on the annual report.
The Angry Mob event causes the player to lose all his tools, including any tractors.
In the event of a Civil War there’s a 75% risk that each owned tractor will be lost or destroyed in the conflict.
WikiPedia entry for Tractor:
“Boosting farm productivity in Africa through the sustainable use of machines,” Food and Agriculture Organization of the United Nations, 2018:
“This startup lets African farmers hire an on-demand tractor to boost their harvests” by Adele Peters, Fast Company, 2018: