- Steam Engine: The first successful steam engine was built by Thomas Newcomen in 1712, but it was inefficient and used only for pumping water out of mines. In 1765, James Watt patented an improved steam engine that was more efficient and versatile, and it became the basis for steam locomotives in the 19th century.

- Boiler: The boiler is the vessel that contains water and produces steam, which powers the engine. The first boilers were simple and dangerous, often exploding due to high pressure. However, in 1774, John Wilkinson invented the cylindrical boiler, which was safer and more efficient. Later, George Stephenson improved the design with the multitubular boiler, which had multiple tubes for increased heat transfer.

- Piston and Cylinder: The piston is a device that moves back and forth within a cylinder, converting the pressure of steam into mechanical motion. It was invented by Thomas Savery in 1698 and later improved by James Watt. The piston and cylinder were crucial components of the steam engine and enabled the locomotive to move.

- Wheels and Tracks: The first steam locomotives ran on wooden tracks, which were often unstable and required frequent repairs. In 1789, William Jessop developed cast iron rails, which were more durable and reliable. The locomotive wheels were also improved, with flanges added to improve traction and reduce derailments.

- Smokestack: The smokestack is the tall chimney on top of the locomotive that releases exhaust from the boiler. It was invented to improve safety by directing the exhaust away from the crew and passengers. Later, it was also used to improve efficiency by creating a draft that increased combustion and reduced emissions.
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