Editing Tractor (section)

=== Nomenclature ===
The term "tractor" (US and Canada) or "tractor unit" (UK) is also applied to:
* '''Road tractors''', '''[[tractor unit]]s''' or traction heads, familiar as the front end of an [[articulated lorry]] / [[semi-trailer truck]]. They are heavy-duty [[vehicle]]s with large [[engine]]s and several [[axle]]s.
** The majority of these tractors are designed to pull long [[semi-trailer]]s, most often to transport freight over a significant distance, and is connected to the trailer with a [[fifth wheel coupling]]. In England, this type of "tractor" is often called an "[[Semi-trailer truck|artic cab]]" (short for "articulated" cab).
** A minority is the [[ballast tractor]], whose load is hauled from a [[Drawbar (haulage)|drawbar]].
* '''[[Pushback (aviation)|Pushback tractors]]''' are used on airports to move aircraft on the ground, most commonly pushing aircraft away from their parking stands.
* [[Locomotive]] tractors ([[engine]]s) or [[rail car mover]]s – the amalgamation of [[machine]]s, [[electrical generator]]s, controls and devices that comprise the [[traction component]] of [[railway]] [[vehicle]]s
* [[Artillery tractor]]s – vehicles used to tow [[artillery]] pieces of varying weights.
* [[NASA]] and [[list of space agencies|other space agencies]] use [[Crawler-transporter|very large tractors]] to move large [[launch vehicle]]s and [[Space Shuttle]]s between their hangars and [[launch pad]]s.
* A [[pipe-tractor]] is a device used for conveying advanced instruments into pipes for measurement and data logging, and the purging of well holes, sewer pipes and other inaccessible tubes.
<gallery class="center" caption="Non-agricultural tractors">
File:UP Diesel.png|Diesel-electric [[locomotive]] at work
File:Trackmobile.jpg|A Trackmobile 4150
File:Tractor-powered Roadroller.jpg|A tractor-driven [[road roller]]
File:Airplane pushing vehicle.jpg|Aircraft [[Pushback (aviation)|pushback tractor]]
File:Backing it in 2.jpg|Road tractor pulling a flatbed trailer
File:Mercedes-Benz-Museum 2015-01 by-RaBoe 187.jpg|[[Unimog 70200]]
File:Tractor for hauling logs, Maine IMG 2036.JPG|A [[Lombard Steam Log Hauler|Lombard steam log hauler]]
</gallery>