A steam locomotive is a type of train that uses steam power to move. It operates by burning fuel, usually coal or wood, to heat water in a boiler. The steam produced creates pressure, which drives pistons connected to the wheels, allowing the locomotive to travel along tracks. These locomotives were widely used from the early 19th century until the mid-20th century, revolutionizing transportation. Famous examples include the Locomotion No. 1, the first steam locomotive to carry passengers, and the Flying Scotsman, known for its speed and design. Steam locomotives played a crucial role in the development of railways worldwide.