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:
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The landing gear of an aircraft.
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The chassis of an automobile.
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The of a tractor or tank.
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The underframe of a locomotive
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The Bogie 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
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