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What (who) is 4-4-2 (locomotive) - definition
LOCOMOTIVE WHEEL ARRANGEMENT
4-4-2T; 4-4-2 locomotive
![415 class]] 4-4-2T of the [[London and South Western Railway]]](https://commons.wikimedia.org/wiki/Special:FilePath/Fletching Bluebell Railway Adams 4-4-2T at Sheffield Park geograph-2982220-by-Ben-Brooksbank.jpg?width=200 "415 class]] 4-4-2T of the [[London and South Western Railway]]")
![GNR's Class C1]] ''Klondyke Atlantic'' of 1898, ''Henry Oakley''](https://commons.wikimedia.org/wiki/Special:FilePath/GNR C2 990 'Henry Oakley' at Doncaster Works.JPG?width=200 "GNR's Class C1]] ''Klondyke Atlantic'' of 1898, ''Henry Oakley''")
![[[Milwaukee Road class A]] no. 1 in 1951.](https://commons.wikimedia.org/wiki/Special:FilePath/Hiawatha streamlined steam locomotive 1951.JPG?width=200 "[[Milwaukee Road class A]] no. 1 in 1951.")
![4-4-2}} [[inspection locomotive]] of the Philadelphia and Reading Railroad](https://commons.wikimedia.org/wiki/Special:FilePath/Inspection-locomotive.jpg?width=200 "4-4-2}} [[inspection locomotive]] of the Philadelphia and Reading Railroad")
![KFNB IId]] Class](https://commons.wikimedia.org/wiki/Special:FilePath/KFNB IId 226.jpg?width=200 "KFNB IId]] Class")
![Precursor Tank Class]]](https://commons.wikimedia.org/wiki/Special:FilePath/LNWR Precursor class tank locomotive 528 (Howden, Boys' Book of Locomotives, 1907).jpg?width=200 "Precursor Tank Class]]")
![E6s Class]]](https://commons.wikimedia.org/wiki/Special:FilePath/PRR E6s 1067.jpg?width=200 "E6s Class]]")
![[[CGR 4th Class 4-4-2]]](https://commons.wikimedia.org/wiki/Special:FilePath/SAR Klasse O4.jpg?width=200 "[[CGR 4th Class 4-4-2]]")
4-4-2 (locomotive)
Under the Whyte notation for the classification of steam locomotives by wheel arrangement, represents a configuration of a four-wheeled leading bogie, four powered and coupled driving wheels, and two trailing wheels supporting part of the weight of the boiler and firebox. This allows a larger firebox and boiler than the configuration.
1 − 2 + 3 − 4 + ⋯
INFINITE SERIES
1 - 2 + 3 - 4 + · · ·; 1 - 2 + 3 - 4 + …; 1 - 2 + 3 - 4 + ...; 1 − 2 + 3 − 4 + …; 1−2+3−4+···; 1-2+3-4+···; 1-2+3-4+…; 1-2+3-4+...; 1−2+3−4+…; 1−2+3−4+...; 1-2+3-4+; 1-2+3-4; 1−2+3−4+; 1−2+3−4; 1 − 2 + 3 − 4 +; 1 − 2 + 3 − 4; 1 - 2 + 3 - 4 +; 1 - 2 + 3 - 4; 1 − 2 + 3 − 4 + . . .; 1 - 2 + 3 - 4 + . . .; 1 − 2 3 − 4 · · ·; 1 - 2 + 3 - 4 ...; 1 − 2 + 3 − 4 + · ·; 1 − 2 + 3 − 4 + ·; 1- 2 + 3 - 4; 1 − 2 + 3 − 4 + ...; 1 − 2 + 3 − 4 + ···; 1 − 2 + 3 − 4 + · · ·
In mathematics, 1 − 2 + 3 − 4 + ··· is an infinite series whose terms are the successive positive integers, given alternating signs. Using sigma summation notation the sum of the first m terms of the series can be expressed as
4-2-4T
![The ''[[C.P. Huntington]]''](https://commons.wikimedia.org/wiki/Special:FilePath/CP Huntington.jpg?width=200 "The ''[[C.P. Huntington]]''")
TANK LOCOMOTIVE WHEEL ARRANGEMENT
4-2-4 (locomotive)
Under the Whyte notation for the classification of steam locomotives, represents the wheel arrangement of four leading wheels on two axles, two powered driving wheels on one axle, and four trailing wheels on two axles. This type of locomotive is often called a Huntington type.
Wikipedia
4-4-2 (locomotive)
Under the Whyte notation for the classification of steam locomotives by wheel arrangement, 4-4-2 represents a configuration of a four-wheeled leading bogie, four powered and coupled driving wheels, and two trailing wheels supporting part of the weight of the boiler and firebox. This allows a larger firebox and boiler than the 4-4-0 configuration.
This wheel arrangement is commonly known as the Atlantic type, although it is also sometimes called a Milwaukee or 4-4-2 Milwaukee, after the Milwaukee Road, which employed it in high speed passenger service.
