Under the Whyte notation system, a Mallet-type locomotive with two leading wheels on a leading truck, two sets of ten driving wheels, and two trailing wheels on a trailing truck.
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 Italian and French classification: 150+051 Turkish classification: 56+56 Swiss classification: 5/6+5/6 The equivalent UIC classification is refined to 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.
The numerical value of 2-10-10-2 in Chaldean Numerology is: 0
The numerical value of 2-10-10-2 in Pythagorean Numerology is: 0
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