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A steam locomotive is a locomotive that provides the force to move itself and other vehicles by means of the expansion of steam. [1]: 80 It is fuelled by burning combustible material (usually coal, oil or, rarely, wood) to heat water in the locomotive's boiler to the point where it becomes gaseous and its volume increases 1,700 times.
Articles about steam locomotives (and locomotive types/classes) built before 1840. Of these, see info-box immediately below for the most well-known individual steam locomotives built before 1830 (listed by year).
Collects steam at the top of the boiler (well above the water level) so that it can be fed to the engine via the main steam pipe, or dry pipe, and the regulator/throttle valve. [2] [5] [6]: 211–212 [3]: 26 Air pump / Air compressor Westinghouse pump (US+) Powered by steam, it compresses air for operating the train air brake system.
Tom Thumb was the first steam locomotive used in the United States; 2400 Old Maude (Class O) was the first Mallet in the United States; 5600 George H. Emerson (Class N-1) was the first duplex locomotive; Class Q-3 was the USRA Light Mikado including the very first built (#4500) Class P-7 was the "president" series of pacifics
Sierra No. 3, often called the "Movie Star locomotive", is a 19th-century 4-6-0 "Ten Wheeler" type steam locomotive owned by the State of California and preserved and operated by the Railtown 1897 State Historic Park in Jamestown, California.
LNER Class A4 4468 Mallard is a 4-6-2 ("Pacific") steam locomotive built in 1938 for operation on the London and North Eastern Railway (LNER) at Doncaster Works to a design of Nigel Gresley.