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InWhyte notation, a4-6-4-4 is arailroadsteam locomotive that has fourleading wheels followed by six coupleddriving wheels, a second set of four driving wheels and fourtrailing wheels.
Other equivalent classifications are:
The sole example of this arrangement was thePRR Q1. This locomotive was essentially a prototype in the development of the PRR Q2, a4-4-6-4.
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