An axle or axletree is a central shaft for a rotating wheel or gear. On wheeled vehicles, the axle may be fixed to the wheels, rotating with them, or fixed to the vehicle, with the wheels rotating aro
Railroad car wheels affixed to a straight axle, limiting them to rotate in unison. This is called a wheelset.
Front-wheel drive is a form of engine and transmission layout used in motor vehicles, in which the engine drives the front wheels only. Most modern front-wheel-drive vehicles feature a transverse engi
The historic 1934 Citroën Traction Avant. Its model name literally means front-wheel-drive, one of the car's break-through innovations.