2-6-6-0

2-6-6-0

Front of locomotive at left

NGR Mallet 2-6-6-0 of 1909

Equivalent classifications UIC class (1C)C, (1'C)C French class 130+030 Turkish class 34+33 Swiss class 3/4+3/3 Russian class 1-3-0+0-3-0

First known tank engine version First use 1904 Country Dutch East Indies (Indonesia) Locomotive SS Class 520 (DKA CC10) Railway Staatsspoorwegen Designer Sachsische Maschinenfabrik (Hartmann) Builder Sachsische Maschinenfabrik

First known tender engine version First use 1909 Country Colony of Natal Locomotive NGR 2-6-6-0, SAR Class MA Railway Natal Government Railways Designer American Locomotive Company Builder American Locomotive Company

Under the Whyte notation for the classification of steam locomotives by wheel arrangement, 2-6-6-0 is a locomotive with one pair of unpowered leading wheels, followed by two sets of three pairs of powered driving wheels and no trailing wheels. The wheel arrangement was principally used on Mallet-type articulated locomotives. Some tank locomotive examples were also built, for which various suffixes to indicate the type of tank would be added to the wheel arrangement, for example 2-6-6-0T for an engine with side-tanks.