The events surrounding the completion and running of the first train on the John Galt Line are significant for their portrayal of two contrasting cognitive camps. James Taggart and others are concerned because public opinion is firmly set against Rearden Metal and Dagny's railroad. In fact, Jim tries to buy steel rail from the Phoenix-Durango line, which is closing. Although such a purchase would be costly, Jim says that the goodwill generated by caving in to public demand would more than compensate the railroad's expense. On the other hand, Dagny and Rearden are utterly unconcerned that public opinion is against them, because they know that they have a vastly more powerful ally — the facts. Rearden Metal is superb, and the facts will speak for themselves.
Through the characters of James Taggart and other parasitic people, Ayn Rand dramatizes the theory that truth is defined by social opinion — that "fifty million Frenchmen can't be wrong," that cognition is a democratic process, and that truth is determined by vote. Through the characters of Dagny and Rearden, Rand exemplifies the theory that truth results when an idea corresponds to facts — that a Rearden Metal bridge will stand or fall based on its molecular properties, not on public opinion. Dagny and Rearden are rational and scientific, relying on facts. James Taggart looks to public opinion for the truth, much like a poll-dependent politician. In a way, the fact that Dagny and Rearden pay no attention to mistaken public opinion is a sign of respect for their fellow man; they are confident that most people are rational enough to accept the truth when they see it for themselves. Dagny and Rearden believe that when the John Galt Line runs successfully, the public will be convinced of the fact that Rearden Metal is superior to any other metal. They believe that the public will ignore the corrupt information they've been fed by government agencies.
The relationship growing between Rearden and Dagny is based on the profound values that they share. Their mutual love of industrialization, technological advance, and man's prosperity on earth goes beyond the immediate commitment that they both have to the Rearden Metal track and the John Galt Line. Likewise, the cognitive method described above — the commitment to facts and the rejection of social opinions — is their deepest connection. Given the principles that they share and the battle that they fight to defend those principles, it is inevitable that Dagny and Rearden fall in love.
