A steam locomotive is a type of railway engine that uses steam power to move. It operates by burning fuel, usually coal or wood, to heat water in a boiler, creating steam. This steam then drives pistons connected to the wheels, propelling the train forward. Steam locomotives were widely used from the early 19th century until the mid-20th century. These locomotives played a crucial role in the development of rail transport, enabling faster and more efficient movement of goods and passengers. Famous examples include the Flying Scotsman and the Mallard, which are celebrated for their speed and engineering.