In the Whyte notation for describing steam locomotive wheel arrangement, a 2-8-6 is a locomotive with a two-wheel leading truck, eight driving wheels, and a six-wheel trailing truck.
All 2-8-6 locomotives constructed have been Mason Bogie tank locomotives.
Four Mason Bogies of this type were built for the Denver, South Park and Pacific Railroad; #25 Alpine, #26 Rico, #27 Roaring Fork and #28 Denver.
The DU&P sold one of the latter to the Burlington and Northwestern Railway, a narrow-gauge affiliate of the CB&Q operating in Iowa.
This steam locomotive-related article is a stub.