Dagny is the heroine and primary narrator of the story. Her great stature comes from the combination of characteristics that she possesses. Her knowledge of engineering and industry enables her to expertly run a transcontinental railroad. Her understanding of physics allows her to identify the virtues of Rearden Metal. The independence of her judgment lets her stand by the metal and her railroad in the face of virtually unanimous social opposition. Her dauntless determination drives her to build the John Galt Line. The qualities that make Dagny a towering character are the same qualities that make real-life individuals such as the scientist Marie Curie and the innovative educator Maria Montessori great heroines. Like these women, Dagny has an unswerving dedication to truth, regardless of social opinion. The dedication to truth supports her ability to discover new knowledge
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