A steam locomotive is a locomotive powered by steam. The term usually refers to its use on railways, but can also refer to a "road locomotive" such as a traction engine or steamroller.Steam locomotives dominated rail traction from the mid 19th century until the mid 20th century, after which they were superseded by diesel and electric locomotives.Many consider the steam locomotive to be one of the most fascinating mechanical devices ever created and passing steam locomotives often grab the attention of bystanders.
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