0-6-6T

0-6-6

Front of locomotive at left

Mason Bogie Single Fairlie, 1874

Equivalent classifications UIC class C3, C3' French class 033 Turkish class 36 Swiss class 3/6 Russian class 0-3-3

First known tank engine version First use 1874 Country United States Locomotive Wm. Mason Railway New Bedford Railroad Designer William Mason Builder Mason Machine Works Evolved to 2-6-6T

Under the Whyte notation for the classification of steam locomotives, 0-6-6 represents the wheel arrangement of no leading wheels, six powered and coupled driving wheels on three axles and six trailing wheels on three axles. All locomotives with this wheel arrangement were tank locomotives; no 0-6-6 tender locomotives were recorded.