MARK SYKES / SCIENCE PHOTO LIBRARY MARK SYKES / SCIENCE PHOTO LIBRARY
Three-cylinder compound steam locomotive. Diagram of a steam locomotive that used three cylinders in its steam engine. A steam engine converts the thermal energy of steam into motion, with the steam driving pistons to turn a crankshaft that turns the wheels. Steam trains were first developed in the 1820s and 1830s, and many designs were developed over the next hundred years.
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