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Cosa (chi) è 2-4-2 2-4-2 - definizione
WIKIMEDIA DISAMBIGUATION PAGE
4-2-4; 4–2–4; 4-2-4 (disambiguation)
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.
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.
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
Wikipedia
424 (disambiguation)
424 is a year in the 5th century of the Gregorian calendar.
424 or 4-2-4 may also refer to:
- 424 BC, a year in the 5th century BC of the Gregorian calendar
- MÁV Class 424, a class of Hungarian steam locomotives
- Area code 424, California, United States
- 4-2-4 (locomotive), a steam locomotive configuration in Whyte notation
- 4-2-4 (association football), an association football (soccer) field formation
