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A shaft thatholds a vehicle's wheels and around which they revolve. In most cars there are two axles, one for the front wheels and one for the back wheels. However, axles are a component of any wheeled vehicle including wagons, trains, and semi-trucks.
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"Rolling stock standard axle on rail" by Pantoine is licensed under CC BY-SA.
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Merriam-Webster.com
N.d. Axle. http://www.merriam-webster.com/dictionary/axle, accessed January 22, 2015.