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Locomotive Wheel Arrangement and Types

Whyte System Symbol	Front to Back	Type
0-4-0	oo	4-wheel switcher
0-6-0	ooo	6-wheel switcher
0-8-0	oooo	8-wheel switcher
0-8-8-0	oooo oooo	Mallet *
0-10-0	ooooo	10-wheel switch.

2-6-0	oUUU	Mogul
2-6-2	oOOOo	Prairie
2-6-6-2	oOOO OOOo	Mallet *
2-6-6-4	oOOO OOOoo	Mallet *
2-6-6-6	oOOO OOOooo	Allegany

2-8-0	oOOOO	Consolidation
2-8-2	oOOOOo	Mikado
2-8-4	oOOOOoo	Berkshire
2-8-8-0	oOOOO OOOO	Mallet *
2-8-8-2	oOOOO OOOOo	Mallet *
2-8-8-4	oOOOO OOOOoo	Yellowstone*
2-8-8-8-2	oOOOO OOOO OOOOoo	Triple *

2-10-0	oOOOOO	Decapod
2-10-2	oOOOOOo	Santa Fe
2-10-4	oOOOOOoo	Texas
2-10-10-2	oOOOOO OOOOOo	Mallet *

4-4-0	ooOO	American
4-4-2	ooOOo	Atlantic
4-4-4	ooOOoo
4-4-4-4	ooOO OOoo	4-cyl **
4-4-6-4	ooOO OOOoo	6-cyl **

4-6-0	ooOOO	10-Wheel
4-6-2	ooOOOo	Pacific
4-6-4	ooOOOoo	Hudson
4-6-4-4	ooOOO OOoo	4-cyl **
4-6-6	ooOOO OOO	Tank
4-6-6-4	ooOOO OOOoo	4-cyl *

4-8-0	ooOOOO	12-Wheel
4-8-2	ooOOOOo	Mountain
4-8-4	ooOOOOoo	Northern ***
4-8-8-2	ooOOOO OOOOo	Mallet *
4-8-8-4	ooOOOO OOOOoo	Mallet *

4-10-0	ooOOOOO	Mastodon
4-10-2	ooOOOOOo	Southern Pacific

4-12-2	ooOOOOOOo	Union Pacific

* =	Mallet articulated
** =	Not articulated
*** =	Aka-Niagra / Pocono
Source:	[AARQJ]

Bibliography

The following sources are utilized in this website. [SOURCE-YEAR-MMDD-PG]:

[AAB| = All Aboard!, by Willis Dunbar, Eerdmans Publishing, Grand Rapids ©1969.
[AAN] = Alpena Argus newspaper.
[AARQJ] = American Association of Railroads Quiz Jr. pamphlet. © 1956
[AATHA] = Ann Arbor Railroad Technical and Historical Association newsletter "The Double A"
[AB] = Information provided at Michigan History Conference from Andrew Bailey, Port Huron, MI

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