4-6-6-4 is a palindrome (it reads the same backward as forward).View more palindromes!
Definition of the noun 4-6-6-4
What does 4-6-6-4 mean as a name of something?
- 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.