Under the Whyte notation system, a duplex steam locomotive that has four leading wheels in a leading truck followed by six coupled driving wheels, a second set with four coupled driving wheels, and four trailing wheels in a trailing truck.
In Whyte notation, a 4-6-4-4 is a railroad steam locomotive that has four leading wheels followed by six coupled driving wheels, a second set of four driving wheels and four trailing wheels. Other equivalent classifications are: UIC classification: 2CB2 French classification: 2322 Turkish classification: 3524 Swiss classification: 3/5+2/4 up to the early 1920s, later 5/9 The sole example of this arrangement was the PRR Q1. This locomotive was essentially a prototype in the development of the PRR Q2, a 4-4-6-4.
The numerical value of 4-6-4-4 in Chaldean Numerology is: 0
The numerical value of 4-6-4-4 in Pythagorean Numerology is: 0
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