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How a Steam Locomotive Works. In this animation, the red color represents live steam entering the cylinder, while the blue represents expanded (spent) steam being exhausted from the cylinder. Click on the image to see the animation. Source: <a href="http://commons.wikimedia.org/wiki/File:Walschaerts_motion.gif"> Wikipedia Commons</a>

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How a Steam Locomotive Works. In this animation, the red color represents live steam entering the cylinder, while the blue represents expanded (spent) steam being exhausted from the cylinder. Click on the image to see the animation. Source: Wikipedia Commons