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What (who) is 4-2-2-0 - definition
4-2-2-0
LOCOMOTIVE WHEEL ARRANGEMENT
Under the Whyte notation for the classification of steam locomotives, 4-2-2-0 represents the wheel arrangement of four leading wheels on two axles, four powered but uncoupled driving wheels on two axles, and no trailing wheels. The arrangement became known as double single.
2-4-0
![LNWR's Improved Precedent class]] ''Hardwicke'' at York Railway Museum](https://commons.wikimedia.org/wiki/Special:FilePath/790 Hardwicke at NRM York - DSC07757.JPG?width=200 "LNWR's Improved Precedent class]] ''Hardwicke'' at York Railway Museum")
![Denver & Rio Grande]]](https://commons.wikimedia.org/wiki/Special:FilePath/Baldwin 2-4-0, Denver & Rio Grande Montezuma, 1871.jpg?width=200 "Denver & Rio Grande]]")
![2-4-0T ''Ebden'']] in Cape Town, c. 1872](https://commons.wikimedia.org/wiki/Special:FilePath/CGR ex CTR&D no. 10 Ebden 2-4-0T.jpg?width=200 "2-4-0T ''Ebden'']] in Cape Town, c. 1872")
![0298 Class]] [[Well tank]] locomotive](https://commons.wikimedia.org/wiki/Special:FilePath/LSWR 0298 Class Beattie Well Tank 4.jpg?width=200 "0298 Class]] [[Well tank]] locomotive")
![[[Midland Railway]] 158A of 1866](https://commons.wikimedia.org/wiki/Special:FilePath/MR 158A at Swanwick 1.jpg?width=200 "[[Midland Railway]] 158A of 1866")
LOCOMOTIVE WHEEL ARRANGEMENT
2-4-0T; 2-4-0WT; 1-2-0; 2-4-0ST
Under the Whyte notation for the classification of steam locomotives, represents the wheel arrangement of two leading wheels on one axle, four powered and coupled driving wheels on two axles and no trailing wheels.
2-4-4-0
ARTICULATED STEAM LOCOMOTIVE WHEEL ARRANGEMENT
2-4-4-0T; 1-2-0+0-2-0
In the Whyte notation for the classification of steam locomotive wheel arrangement, a 2-4-4-0 is a locomotive with two leading wheels, two sets of four driving wheels, and no trailing wheels. Examples of this type were constructed as Mallet locomotives.
