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Undercarriage is the part of a moving vehicle that is underneath the main body of the vehicle. The term originally applied to this part of a horse-drawn carriage, and usage has since broadened to include:
- The landing gear of an aircraft.
- The chassis of an automobile.
- The tractor treads of a tractor or tank.
- The underframe of a locomotive
- The undercarriage assembly of a train car or locomotive, known as a bogie, incorporating the train wheel sets, suspension, brakes and, in powered units, the traction motors