The armature is also different in a high stack vs a normal stack motor. Its thickness matches the extra thick field set up. Lionel also balanced them to a higher tollerance, along with line boring the motor bushings to assure straightness(like is done in a high quality auto engine rebuild). This assured an extra smooth, cool running motor to showcase the model and minimize break downs on a display layout that would see trains running for hours on each day, especially during the holiday selling season. AD
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