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Contact patch
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===Railroad steel wheel on rail=== The contact patch of a railroad wheel is much smaller than for pneumatic rubber tires; it is only about the size of a [[Dime (United States coin)|dime]] (252 mm<sup>2</sup>).<ref>Eric Magel, Joe Kalousek, Mike Roney, "Stress reduction, railroad style: the contact area where wheel meets rail is about the size of a dime. Making it as stress-free as possible can save big dollars". Railway Age, July, 2002. [http://findarticles.com/p/articles/mi_m1215/is_7_203/ai_90190965/ findarticles.com]</ref>
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