2-6-6-2

First known tender engine version
First known tender engine version
First use	1906
Country	United States
Locomotive	Class L-1 2-6-6-2
Railway	Great Northern Railway
Designer	Baldwin Locomotive Works
Builder	Baldwin Locomotive Works
Evolved from	0-6-6-0, 2-6-6-0
Evolved to	2-6-8-0, 2-8-8-2
Benefits	Able to follow tighter curve than contemporary 2-10-2 locomotives of similar tractive effort
Drawbacks	Higher maintenance costs due to a second set of cylinders and valve gear

Equivalent classifications
Equivalent classifications
UIC class	(1C)C1, (1'C)C1'
French class	130+031
Turkish class	34+34
Swiss class	3/4+3/4
Russian class	1-3-0+0-3-1

2-6-6-2
UIC class
Equivalent classifications
UIC class	(1C)C1, (1'C)C1'
French class	130+031
Turkish class	34+34
Swiss class	3/4+3/4
Russian class	1-3-0+0-3-1
First use
First known tender engine version
First use	1906
Country	United States
Locomotive	Class L-1 2-6-6-2
Railway	Great Northern Railway
Designer	Baldwin Locomotive Works
Builder	Baldwin Locomotive Works
Evolved from	0-6-6-0, 2-6-6-0
Evolved to	2-6-8-0, 2-8-8-2
Benefits	Able to follow tighter curve than contemporary 2-10-2 locomotives of similar tractive effort
Drawbacks	Higher maintenance costs due to a second set of cylinders and valve gear

Under the Whyte notation for the classification of steam locomotives by wheel arrangement, a 2-6-6-2 is a locomotive with one pair of unpowered leading wheels, followed by two sets of three pairs of powered driving wheels and one pair of trailing wheels. The wheel arrangement was principally used on Mallet-type articulated locomotives, although some tank locomotive examples were also built. A Garratt locomotive or Golwé locomotive with the same wheel arrangement is designated 2-6-0+0-6-2 since both engine units are pivoting.

Under the UIC classification the wheel arrangement is referred to as (1'C)C1' for Mallet locomotives.

^ Mellin, C. J. (1908). Articulated Compound Locomotives. New York, N. Y.: American Locomotive Company. pp. 20–21.
^ Drury, George H. (2015). Guide to North American Steam Locomotives, revised edition. Waukesha, Wisconsin: Kalmbach Books. p. 181. ISBN 978-1-62700-259-2.
^ LeMassena, Robert A (1991). Articulated Steam Locomotives of North America, vol. 2. Denver, Col.: Sundance Publications, Ltd. p. 35. ISBN 0-913582-54-9.
^ LeMassena, p. 103.