In full caterpillar tractor: a type of tractor which travels upon two endless steel bands, one on each side of the machine, to facilitate travel…

In full crawler tractor. A kind of tractor moving on an endless chain; also elliptical. So crawler track.

a vehicle used in swampy regions; spec. a tracked vehicle which can pull a heavily loaded trailer.

A tracked vehicle capable of travelling over difficult terrain; spec. (a) a light cargo and personnel carrier (U.S. Military); (b) a snow tractor…