Steam locomotives are powerful trains that use steam engines to move. They burn coal, wood, or oil to heat water in a boiler, creating steam. This steam pushes pistons that turn the wheels, allowing the train to travel along tracks. Steam locomotives were widely used from the early 19th century until the mid-20th century. These trains played a crucial role in the development of railroads and the transportation of goods and people. 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.