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truck 
Two- or three-axled carriage whose wheels are guided by the track; it supports a locomotive or a car.
spring
Part absorbing vibrations caused by the wheels as they move along the track.
truck frame
Framework supporting the axles, suspension, brakes and traction motors.
journal box
Part connecting the axle to the truck frame.
axle
Transversal part under a vehicle passing through the hubs of the wheels, which support it.
