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