A Crawler tractor (also called: track-type tractor, tracked vehicle, or track-laying vehicle) is a vehicle that runs on tracks instead of wheels. Typically used as part of an Engineering vehicle once additional attachments have been added, such as a bulldozer blade, or a ripper. For Farm use usually fitted with a 3-point linkage for fitting Mounted implements. But most earlt machines just used trailed implements attached to the drawbar. Some specialist operations use vehicles equipped with very wide tracks called Low Ground Pressure (LGP) machines, such as for Peat Harvesting or Bog work.