A coupling rod is a solid metal bar used to link the wheels of two nearby railway vehicles, ensuring they move together in a synchronized way. It connects the wheels, allowing them to rotate at the same speed and maintain smooth movement across the tracks. This bar plays a key role in ensuring that the wheels work together efficiently, which is crucial for the proper functioning of steam locomotives and some other types of rail vehicles. By connecting the wheels, the coupling rod helps distribute the power from the engine evenly, allowing the train to move more smoothly.

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