Under the Whyte notation system, a Mallet-type locomotive with four leading wheels on a leading truck, two sets of six driving wheels, and two trailing wheels on a trailing truck.
In Whyte notation, a 4-6-6-2 is a steam locomotive with four leading wheels in an unpowered bogie at the front of the locomotive followed by two sets of driving wheels with six wheels each, followed by two unpowered trailing wheels at the rear of the locomotive. Other equivalent classifications are: UIC classification: 2CC1 French classification: 230+031 Turkish classification: 35+34 Swiss classification: 3/5+3/4 This locomotive wheel arrangement was used in only a very limited number of locomotives in North America, most notably as class MM-2 cab forward locomotives on the Southern Pacific Railroad. These were effectively 2-6-6-4s running in reverse. They were originally built as 2-6-6-2s but were refitted with a four-wheel leading truck to increase stability at speed.
The numerical value of 4-6-6-2 in Chaldean Numerology is: 0
The numerical value of 4-6-6-2 in Pythagorean Numerology is: 0
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