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Terminal tractor
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<p>A terminal tractor, known in the United States as a shag truck, shunt truck, spotter truck, spotting tractor, yard truck, yard shifter, yard dog, yard goat, yard horse, yard mule, yard jockey, yard spotter, hostler, or mule, is a kind of <a href="/facts/Tractor_unit/NU8CNXkC">semi-tractor</a> intended to move <a href="/facts/Semi-trailer/p2E4Lumj">semi-trailers</a> within a cargo yard, warehouse facility, or intermodal facility, much like a <a href="/facts/Switcher_locomotive/YePejodG">switcher locomotive</a> is used to position railcars. In the United Kingdom they are known as terminal lorries or terminal trucks. </p>