Powerful crawler constrution equipment with a blade is called a bulldozer. Even though any heavy engineering vehicle is known by the term “bulldozer”, practically the term refers only to a tractor with dozer blade.
Earlier tractors were used to plough the fields and the first bulldozer was adapted from this tractor. During the First World War a bulldozer was used as an armoured tank because of its versatility in grounds which were soft.
A big thick metal plate is fixed on the front of the bulldozers for use in earthmoving jobs, raising dams and digging canals. As the tractor advances, the blade in front removes layers of soil. To move coal in the coalmines, to move large boulders or cut tree stumps, various specialized blades are used. Earlier, the driver used to sit on top of the bulldozers, which lacked a cabin. When powered down bulldozers were introduced in the 1930’s it became the excavation equipment preferred by contractors.
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