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2-6-6-2 Articulated Mallet Steam Locomotive
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 type locomotive with the same wheel arrangement is designated 2-6-0+0-6-2.

2-6-6-2 Overview
Equivalent classifications: 

UIC class: 1CC1, refined to: (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 known tender engine version
First use: 1910
Country: South Africa
Locomotive SAR Class: MD
Railway: Central South African Railways
Designer: American Locomotive Company
Builder: American Locomotive Company

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

The 2-6-6-2 wheel arrangement was most often used for articulated compound steam Mallet locomotives. In a compound Mallet, the rear set of coupled wheels are driven by the smaller high pressure cylinders, from which spent steam is then fed to the larger low pressure cylinders that drive the front set of coupled wheels.

This type of locomotive was commonly used in North America on logging railroads. The 2-6-6-2 wheel arrangement was also used in South Africa and the Soviet Union.

Great Northern Baldwin-built 2-6-6-2 No. 1800, 1901. Railway and Locomotive Engineering
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Great Northern Baldwin-built 2-6-6-2 No. 1800, 1901. Railway and Locomotive Engineering

Flexible-boilered Mallet system steam locomotive of the Atchison, Topeka and Santa Fe Railroad, 1914. Source "Manipulation of Mallet Locomotives", 1914, the Cropley Phillips Company.
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A schematic drawing of the 2-6-6-2 steam locomotive wheel arrangement.

A schematic drawing of the 2-6-6-2 steam locomotive wheel arrangement.

Flexible-boilered Mallet system steam locomotive of the Atchison, Topeka and Santa Fe Railroad, 1914.

Source "Manipulation of Mallet Locomotives", 1914, the Cropley Phillips Company.

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