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Что (кто) такое 2-8-4 - определение
2-8-4
![SAR Class 24]], 1983](https://commons.wikimedia.org/wiki/Special:FilePath/243696-Beaconsfield-1983-Apr-13-HGG.jpg?width=200 "SAR Class 24]], 1983"){kind=tracking}
![CFR 142.072 at the [[Reşiţa]] Museum](https://commons.wikimedia.org/wiki/Special:FilePath/CFR 142.072 romanian steam locomotive in Resita museum.jpg?width=200 "CFR 142.072 at the [[Reşiţa]] Museum")
![CSAR Class C]]](https://commons.wikimedia.org/wiki/Special:FilePath/CSAR Class C 2-8-4T (IMR 100).jpg?width=200 "CSAR Class C]]")
![A [[JNR Class D60]] 2-8-4 preserved in Ashiya Town, Fukuoka, Japan.](https://commons.wikimedia.org/wiki/Special:FilePath/JNR D6061.jpg?width=200 "A [[JNR Class D60]] 2-8-4 preserved in Ashiya Town, Fukuoka, Japan.")
![BBÖ Class 114 No. 12.10]] at the Eisenbahnmuseum Strasshof, 2007](https://commons.wikimedia.org/wiki/Special:FilePath/Strasshof 2007 12.10.jpg?width=200 "BBÖ Class 114 No. 12.10]] at the Eisenbahnmuseum Strasshof, 2007")
![Soviet Class IS]] with streamline casing at the Voroshilovgrad factory](https://commons.wikimedia.org/wiki/Special:FilePath/Паровоз ИС20-16 1937.jpg?width=200 "Soviet Class IS]] with streamline casing at the Voroshilovgrad factory")
LOCOMOTIVE WHEEL ARRANGEMENT
2-8-4T; 1-4-2
Under the Whyte notation, a 2-8-4 is a steam locomotive that has two unpowered leading wheels, followed by eight coupled and powered driving wheels, and four trailing wheels. This locomotive type is most often referred to as a Berkshire, though the Chesapeake and Ohio Railway used the name Kanawha for their 2-8-4s.
1 − 2 + 4 − 8 + ⋯
INFINITE SERIES
1 − 2 + 4 − 8 + 16 − · · ·; 1 + 2 + 4 + 8 +...; 1 + 2 + 4 + 8 +..; 1 + 2 + 4 + 8 +.; 1+2+4+8.; 1+2+4+8..; 1+2+4+8+..; 1+2+4+8+.; 1 − 2 + 4 − 8 + · · ·; 1 − 2 + 4 − 8 + …; 1 − 2 + 4 − 8 + ...
In mathematics, is the infinite series whose terms are the successive powers of two with alternating signs. As a geometric series, it is characterized by its first term, 1, and its common ratio, −2.
4-8-2
.jpg?width=200)
![[[SNCF Class 241P]] No. 241.P 17](https://commons.wikimedia.org/wiki/Special:FilePath/241P17 à Dole.JPG?width=200 "[[SNCF Class 241P]] No. 241.P 17")
![NSWGR D57 class]] No. 5701](https://commons.wikimedia.org/wiki/Special:FilePath/5701 at Clyde 1929.jpg?width=200 "NSWGR D57 class]] No. 5701")
![Robertson]]](https://commons.wikimedia.org/wiki/Special:FilePath/HGG-14CRB-2004-Robertson-South-Africa.jpg?width=200 "Robertson]]")
![NGR Class D]]](https://commons.wikimedia.org/wiki/Special:FilePath/NGR Class A (4-8-2).jpg?width=200 "NGR Class D]]")
![PRR Class M1]]](https://commons.wikimedia.org/wiki/Special:FilePath/PRR M1a.jpg?width=200 "PRR Class M1]]")
 220481.jpg?width=200 "Class 12R crossing the Great Fish River")
![Class 15AR No. 1788 at [[Graaff-Reinet]]](https://commons.wikimedia.org/wiki/Special:FilePath/SAR Class 15AR 1788 Graaff-Reinet 040478.jpg?width=200 "Class 15AR No. 1788 at [[Graaff-Reinet]]")
![Class 15E at [[Magaliesburg]]](https://commons.wikimedia.org/wiki/Special:FilePath/SAR Class 15E 2878 (4-8-2).jpg?width=200 "Class 15E at [[Magaliesburg]]")
.jpg?width=200 "Class 19A at Paardeneiland, circa 1940")
![Touws River]]](https://commons.wikimedia.org/wiki/Special:FilePath/SAR Class 23 2556 (4-8-2) 1.JPG?width=200 "Touws River]]")
 NGR 332.jpg?width=200 "Ex NGR Class Hendrie D, SAR Class 3")
![Worcester]]](https://commons.wikimedia.org/wiki/Special:FilePath/SAR Class 4 (4-8-2).jpg?width=200 "Worcester]]")
![[[WAGR W class]] No. W934](https://commons.wikimedia.org/wiki/Special:FilePath/WAGR locomotive W934 at Woolshed Flat.jpg?width=200 "[[WAGR W class]] No. W934")
LOCOMOTIVE WHEEL ARRANGEMENT
4-8-2T; 2-4-1; 4-8-2 Mountains
Under the Whyte notation for the classification of steam locomotives, represents the wheel arrangement of four leading wheels, eight powered and coupled driving wheels and two trailing wheels. This type of steam locomotive is commonly known as the Mountain type.
