4-4-0

A 4-4-0 is a type of steam locomotive. In the Whyte notation, 4-4-0 sigifies that it has a two-axle bogie to help guide it into curves, and two driving axles coupled by a connecting rod. The 4-4-0 is most commonly known as an American type. Almost every major railroad that operated in North America in the first half of the 19th century owned and operated locomotives of this type. The famous locomotive named The General was a 4-4-0.

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The equivalent UIC classification is 2'B.

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The first use of the name American to describe locomotives of this wheel arrangement was made by Railroad Gazette in April 1872. Before that time, this wheel arrangement was known as a Standard or Eight-Wheeler. This locomotive type was so successful on US railroads that many earlier 4-2-0 and 2-4-0 locomotives were rebuilt as 4-4-0s by the middle of the 19th century.

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Steam locomotive: 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....

Whyte notation: The Whyte notation for classifying steam locomotives by wheel arrangement was devised by Frederick Methvan Whyte and came into use in the early 20th century. Whyte's system counts the number of leading wheels, then the number of driving wheels, and finally the number of trailing wheels, this being t...

Bogie: A bogie (UK) or wheel truck (US) is a structure underneath a train to which wheel axles (and, hence, wheels) are attached. If they are used there are usually two for each carriage, wagon and locomotive, or alternatively, they are at the connections between the carriages or wagons. The connections of...

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