High Quality Content by WIKIPEDIA articles! A steam locomotive is a locomotive powered by a steam engine. The term usually refers to its use on railways, but can also refer to a "road locomotive" such as a traction engine or steamroller. Beginning in Britain, steam locomotives dominated railway usage from the start of the 19th century, until the middle of the 20th Century. They were gradually improved and developed in their over 150 years of development and use. Starting in about 1930 other types of engines were developed and steam locomotives were gradually superseded by diesel and electric locomotives.

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