Postcard depiction of a Santa Fe 2-10-10-2 Demonstration Train at Emporia, Kansas in 1912.

Historic Rail - Shop Now! Enter the World of Artisan Wines. Get your first 3 months at 50% off. Snake River Farms Wagyu Brisket

Classic Streamliners - TRAIN​CYCLOPEDIA

Postcard depiction of a Santa Fe 2-10-10-2 Demonstration Train at Emporia, Kansas in 1912.
A diagram of the 2-10-10-2 Wheel Arrangement.
NFLShop.com - NFL Jerseys and Gear
Shop for Railroad and Train Collectibles on eBay

A diagram of the 2-10-10-2 Wheel Arrangement.

Enter the Classic Streamliners Bookstore.
Enter the Classic Streamliners Bookstore.
NFLShop.com - NFL Jerseys and Gear
Shop for Trains and Railroad Collectibles on eBay

2-10-10-2 Articulated Mallet Locomotive
Under the Whyte notation for the classification of steam locomotive wheel arrangements, a 2-10-10-2 is a locomotive with two leading wheels, two sets of ten driving wheels, and a pair of trailing wheels.

Other equivalent classifications are:
UIC classification: 1EE1 (also known as German classification and Swiss classification)
Italian and French classification: 150+051
Turkish classification: 56+56
Swiss classification: 5/6+5/6

The equivalent UIC classification is refined to (1′E)E1′ for Mallet locomotives. All 2-10-10-2 locomotives have been articulated locomotives, Mallet locomotives in particular.

This wheel arrangement was rare. Only two classes of 2-10-10-2 locomotives have been built; the Atchison, Topeka and Santa Fe Railway's 3000 class, and the Virginian Railway's class AE.

See also:

AT&SF 3000 Class 2-10-10-2

Virginian Class AE 2-10-10-2

Steam Locomotives

Locomotives