Under the Whyte notation for the classification of steam locomotives, a 2-10-10-10-10-10-2 has two leading wheels, five sets of ten driving wheels, and two trailing wheels. Because of its length, such a locomotive must be an articulated locomotive. It is not longer than a normal articulated; the fourth and fifth sets of drivers are located under the tender.

Other equivalent classifications are:

The equivalent UIC classification is to be refined to (1'E)EEE(E1').


The Baldwin Locomotive Company may have developed a design for a 2-10-10-10-10-10-2 quintuplex; a drawing of this proposal appeared in Trains magazine. It was shown to be the largest and most powerful steam locomotive in the world. [1][2][3]


  1. "The Quadraplexes". www.douglas-self.com. Retrieved 10 December 2017.
  2. Solomon, Brian, 2015. The Majesty of Big Steam. Voyageur Press. ISBN 978-0760348925
  3. Drury, George H. (1993). Guide to North American Steam Locomotives. Waukesha, Wisconsin: Kalmbach Publishing Company.
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