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In a piston engine, a 'piston rod' joins a piston to a connecting rod.
Many internal combustion engines, and in particular all current automobile engines, do not have true piston rods, and the term ''piston rod'' is often used as a synonym for ''connecting rod'' in the context of these engines.
All engines with crossheads do have true piston rods. These include most steam locomotives and large marine diesel engines.

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