2-6-6-0

In Whyte notation for the classification of steam locomotives by wheel arrangement, a 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.

Other equivalent classifications are:

UIC classification: 1CC (also known as German classification and Italian classification)

French classification: 130+030

Turkish classification: 34+33

Swiss classification: 3/4+3/3

The only American railroad to purchase these locomotives was the Denver, Northwestern and Pacific Railway, which later became the Denver and Salt Railroad, then Denver and Salt Lake Railway. Towards the end of their life these locomotives were used by the Denver and Rio Grande Western Railroad after their acquired the Denver & Salt Lake. These locomotives were used first over the Rollins Pass and later Moffat Tunnel route of the Denver & Salt Lake. They were all scrapped between 1948-1952 by the D&RGW.