The 2-6-6-6 (in Whyte notation) is an articulated locomotive type with two leading wheels, two sets of six driving wheels and six trailing wheels. Only two classes of the 2-6-6-6 type were built. One was the "Allegheny" class , built by the Lima Locomotive Works .

With a new wheel arrangement came a new name. The C&O selected the name "Allegheny" for the mountain range that this new locomotive would do its work. An article by King in "Trains" in the early 2000s stated that the C&O Alleghenies cost around $230,000 each.

2024年11月4日 · The Allegheny is widely regarded as the most powerful steam locomotive ever built in terms of drawbar horsepower (dbhp). The articulated design was of the 2-6-6-6 wheel arrangement and based purely on horsepower and tractive effort nothing could top it.

The specs for the rear truck's three axles used the standard friction bearing notation (diameter x length). The wheels in the front and center axles in the truck were smaller and had 7" x 14" (179 x 356 mm) bearings. The larger rear axle's wheels used 9" x 14" (229 x 356 mm) bearings.

The 2-6-6-6 (in Whyte notation) is an articulated locomotive type with two leading wheels, two sets of six driving wheels and six trailing wheels. Only two classes of the 2-6-6-6 type were built. One was the "Allegheny" class, built by the Lima Locomotive Works.

Railroads that used 2-6-6-6 "Allegheny" Locomotives in the USA (data provided by Steve Llanso of Sweat House Media)

The 1858 Sam Hill characterizes locomotives of the mid nineteenth century. The mammoth 1941 Allegheny symbolizes the peak of steam locomotive technology. Larger size brought greater power, and the Allegheny reached the practical limits of both.

Chesapeake and Ohio (C&O) “Allegheny” locomotives are considered among the powerful and largest steam locomotives ever built. Introduced in 1941, the C&O Allegheny represents the peak of steam locomotive technology.

2006年6月16日 · Large, high tenders with 14 wheels trailed the engines, holding 25,000 gallons of water and 25 tons of coal. Lima delivered the first ten 2-6-6-6s in 1941. Classified by the railroad as H-8s, they were put to work hauling West Virginia coal eastward, and were soon given the name “Allegheny.”

The 2-6-6-6 (in Whyte notation) is an articulated locomotive type with two leading wheels, two sets of six driving wheels and six trailing wheels. Only two classes of the 2-6-6-6 type were built. One was the "Allegheny" class, built by the Lima Locomotive Works.