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4-6-6-4 is a palindrome (it reads the same backward as forward).

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Definition of the noun 4-6-6-4

What does 4-6-6-4 mean as a name of something?


  1. Under the Whyte notation system, a Mallet-type locomotive with four leading wheels on a leading truck, two sets of six driving wheels, and four trailing wheels on a trailing truck.


4-6-6-4: In Whyte notation, a 4-6-6-4 is a railroad steam locomotive that has four leading wheels followed by six coupled driving wheels, a second set of six driving wheels and four trailing wheels. 4-6-6-4's are commonly known as Challengers. Challengers were most common in the Union Pacific Railroad and the Clinchfield Railroad.

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