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
See also Bicycle frame Container chassis Locomotive bed Locomotive frame Motorcycle frame