A steam locomotive is a type of train that is powered by steam generated from boiling water. It uses a boiler to heat water, creating steam that pushes pistons connected to the wheels, allowing the train to move. Steam locomotives were widely used in the 19th and early 20th centuries, revolutionizing transportation and industry. These locomotives played a crucial role in the expansion of railroads, connecting cities and facilitating trade. Famous examples include the Locomotion No. 1, the first steam locomotive to run on a public railway, and the Flying Scotsman, known for its speed and elegance.