4-6-4-4
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In Whyte notation, a 4-6-4-4[1] 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 (also known as German or Italian 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.
References
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