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Old 03-30-2011, 10:26 PM   #1505
Beastly Adventurer
Joined: Sep 2010
Oddometer: 14,736
Originally Posted by squonker View Post
A 'regular' B-train (two axle bridge)

A Super-B train (tri-axle bridge)
Neither of those look right to me. Around here there will be tandems on the lead trailer, tandems on what my dad called the converter (the middle fifthwheel), then tandems on the following trailer, for a total of six axles, plus three axles (steering, drive, and tag or steering and two drive) on the tractor. Triples are different, since the trailers are shorter, so each trailer will have one axle, each converter has one, and the tractor will have two or three, for a total of 7 or 8 axles. Pulling two short trailers, there would be one axle on each trailer, one on the converter, and most likely only one non-steering axle on the tractor, for five total. Other weirdness is stuff like P.I.E. equipment that had pseudo three axle tractors where the third axle carried a separate fifthwheel and the whole unit could detach to permit pulling doubles without having to hunt around for a converter ('cause you brought your own with you).
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