Where did that term, "traction motor unraveling" come from. Most traction motor armatures are not wound with one continuous long wire like most small motors we see in daily life. The armatures used in traction motors have long slots in them running parallel to the axle going thru it. Each slot is about 3/4" wide and 3/4" deep, running down the whole length of the armature, that insulated lengths of copper bars (about 1/8"x1/4") are grouped together then wrapped with fiberglass tape to create a 3/4" squares which are driven down into the slots with a leather headed hammer. Maybe it's possible for those squares to get pulled out of there slots from the centrifugal forces increasing at higher speeds. Never saw it though in the motors I helped rebuild. There may be wire wrapped armatures in very small traction motors, like trolley cars used, that can unravel, but I never worked on them to know.
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