- 4-6-6-2
In
Whyte notation , a 4-6-6-2 is asteam locomotive with fourleading wheel s (two axles) in an unpoweredbogie at the front of the locomotive followed by two sets ofdriving wheel s with six wheels each (three axles each), followed by two unpoweredtrailing wheel s (one axle) at the rear of the locomotive.Other equivalent classifications are:
UIC classification : 2CC1 (also known asGerman classification andItalian classification )French classification : 230+031Turkish classification : 35+34Swiss classification : 3/5+3/4This locomotive wheel arrangement was used in only a very limited number of locomotives in
North America , most notably as class MM-2cab forward locomotives on theSouthern Pacific Railroad . [cite book| author=Diebert, Timothy S. and Strapac, Joseph A.| title=Southern Pacific Company Steam Locomotive Conpendium| publisher=Shade Tree Books| year=1987| id=ISBN 0-930742-12-5] These were effectively2-6-6-4 s running in reverse. They were originally built as2-6-6-2 s but were refitted with a four-wheel leading truck to increase stability at speed.References
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