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Qu'est-ce (qui) est 2-4-4-2 - définition
2-4-4-2
ARTICULATED LOCOMOTIVE WHEEL ARRANGEMENT
2-4-4-2T
In Whyte notation, 2-4-4-2 refers to a railroad steam locomotive that has two leading wheels followed by four coupled driving wheels, a second set of four coupled driving wheels, and two trailing wheels.
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
2-4-2
![K class]] no. K88 ''Washington''](https://commons.wikimedia.org/wiki/Special:FilePath/K 88 at The Plains.jpg?width=200 "K class]] no. K88 ''Washington''")
![[[St. Louis, Iron Mountain and Southern Railway 5]] was built as a 2-4-2T, but it was later modified as a tender engine by the [[Crab Orchard and Egyptian Railway]].](https://commons.wikimedia.org/wiki/Special:FilePath/St. Louis, Iron Mountain & Southern -5 (Porter 2-4-2) - 10570956923.jpg?width=200 "[[St. Louis, Iron Mountain and Southern Railway 5]] was built as a 2-4-2T, but it was later modified as a tender engine by the [[Crab Orchard and Egyptian Railway]].")
![The engine ''Hope'']], c. 1948](https://commons.wikimedia.org/wiki/Special:FilePath/Walvisbaai 2-4-2T.jpg?width=200 "The engine ''Hope'']], c. 1948")
LOCOMOTIVE WHEEL ARRANGEMENT
2-4-2T
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 two trailing wheels on one axle. The type is sometimes named Columbia after a Baldwin locomotive was showcased at the 1893 World's Columbian Exposition held at Chicago, Illinois.
