Steam Locomotive Wheel Arrangements

The following table lists the wheel arrangements and names of a number of the best known steam locomotives. This classification system was developed by F. M. Whyte. The wheel arrangment consists of the number of leading wheels, the number of drivers, and the number of trailing wheels.

Arrangement	Whyte Classification	Name
OO	0-4-0	Four-coupled
OO-OO	0-4-4-0	Articulated
OOO	0-6-0	Six-coupled
OOO-OOO	0-6-6-0	Mallet
OOOO	0-8-0	Eight-coupled
OOOO-OOOO	0-8-8-0	Angus
OOOOO	0-10-0	Ten-coupled
OOOOOo	0-10-2	Union
oOOo	2-4-2	Columbian
oOOO	2-6-0	Mogul
oOOOo	2-6-2	Prairie
oOOO-OOOo	2-6-6-2	Articulated
oOOO-OOOoo	2-6-6-4	A-Class
oOOO-OOOooo	2-6-6-6	Allegheny
oOOO-OOOO	2-6-8-0	Articulated
oOOOO	2-8-0	Consolidation
oOOOOo	2-8-2	Mikado
oOOOOoo	2-8-4	Berkshire
oOOOO-OOOO	2-8-8-0	Bull Moose
oOOOO-OOOOo	2-8-8-2	Chesapeake
oOOOO-OOOOoo	2-8-8-4	Yellowstone
oOOOO-OOOO-OOOOo	2-8-8-8-2	Triplex
oOOOO-OOOO-OOOOoo	2-8-8-8-4	Triplex
oOOOOO	2-10-0	Decapod
oOOOOOo	2-10-2	Santa Fe
oOOOOOoo	2-10-4	Texas
oOOOOO-OOOOOo	2-10-10-2	Mallet
ooOoo	4-2-4	Huntington
ooOO	4-4-0	American
ooOOo	4-4-2	Atlantic
ooOOoo	4-4-4	Reading
ooOO-OOoo	4-4-4-4	Duplex
ooOO-OOOo	4-4-6-2	Articulated
ooOO-OOOoo	4-4-6-4	Duplex Drive
ooOOO	4-6-0	Ten wheeler
ooOOOo	4-6-2	Pacific
ooOOOoo	4-6-4	Hudson
ooOOO-OOoo	4-6-4-4	Duplex Drive
ooOOO-OOOoo	4-6-6-4	Challenger
ooOOOO	4-8-0	Twelve Wheeler
ooOOOOo	4-8-2	Mountain
ooOOOOoo	4-8-4	Northern
ooOOOO-OOOOo	4-8-8-2	Cab Forward
ooOOOO-OOOOoo	4-8-8-4	Big Boy
ooOOOOO	4-10-0	Mastodon
ooOOOOOo	4-10-2	Overland
ooOOOOOOo	4-12-2	Union Pacific
oooOO-OOooo	6-4-4-6	Pennsylvania
oooOOOOooo	6-8-6	Turbine

Last updated: 24 Feb 2023

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