Under the Whyte notation system, a duplex steam locomotive that has four leading wheels in a leading truck followed by four coupled driving wheels, a second set with six coupled driving wheels, and four trailing wheels in a trailing truck.
A 4-4-6-4, in the Whyte notation for the classification of steam locomotives by wheel arrangement, is one that has four leading wheels followed by four coupled driving wheels, a second set of six coupled driving wheels and four trailing wheels. The Pennsylvania Railroad's Q2 class were the only locomotives ever to use this arrangement. These were duplex locomotives, in which both sets of driving wheels were mounted in a common, rigid locomotive frame. This locomotive design was a further development of the highly successful 2-10-4. The divided drive, or duplex arrangement, allowed for higher speeds with less damage to the track. Other equivalent classifications are: UIC classification: 2BC2 French classification: 2232 Turkish classification: 2435 Swiss classification: 2/4+3/5 up to the early 1920s, later 5/9
The numerical value of 4-4-6-4 in Chaldean Numerology is: 0
The numerical value of 4-4-6-4 in Pythagorean Numerology is: 0
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