Rearden and the leading businessmen of Colorado invest in the John Galt Line. Rearden feels a strong sexual attraction to Dagny but, because he regards sex as a demeaning impulse, doesn’t act on his attraction. The government passes the Equalization of Opportunity Bill that prevents an individual from owning companies in different fields. The bill prohibits Rearden from owning the mines that supply him with the raw materials he needs to make Rearden Metal. However, Rearden creates a new design for the John Galt Line’s Rearden Metal Bridge, realizing that if he combines a truss with an arch, it will enable him to maximize the best qualities of the new metal.
Dagny completes construction of the Line ahead of schedule. She and Rearden ride in the engine cab on the Line’s first train run, which is a resounding success. Rearden and Dagny have dinner at Ellis Wyatt’s home to celebrate. After dinner, Dagny and Rearden make love for the first time. The next day, Rearden is contemptuous of them both for what he considers their low urges, but Dagny is radiantly happy. She rejects Rearden’s estimate, knowing that their sexual attraction is based on mutual admiration for each other’s noblest qualities.
Dagny and Rearden go on vacation together, driving around the country looking at abandoned factories. At the ruins of the Twentieth Century Motor Company’s factory in Wisconsin, they find the remnant of a motor with the potential to change the world. The motor was able to draw static electricity from the atmosphere and convert it to usable energy, but now it is destroyed.
Realizing how much the motor would benefit the transportation industry, Dagny vows to find the inventor. At the same time, she must fight against new proposed legislation. Various economic pressure groups, seeking to cash in on the industrial success of Colorado, want the government to force the successful companies to share their profits. Dagny knows that the legislation would put Wyatt Oil and the other Colorado companies out of business, destroy the Rio Norte Line, and remove the profit she needs to rebuild the rest of the transcontinental rail system, but she’s powerless to prevent the legislation.
Dagny continues her nationwide quest to find the inventor of the motor, and she finally finds the widow of the engineer who ran the automobile company’s research department. The widow tells Dagny that a young scientist working for her husband invented the motor. She doesn’t know his name, but she provides a clue that leads Dagny to a cook in an isolated Wyoming diner. The cook tells Dagny to forget the inventor of the motor because he won’t be found until he chooses. Dagny is shocked to discover that the cook is Hugh Akston, the world’s greatest living philosopher. She goes to Cheyenne and discovers that Wesley Mouch, the new economic coordinator of the country, has issued a series of directives that will result in the strangling of Colorado’s industrial success. Dagny rushes to Colorado but arrives too late. Ellis Wyatt, in defiance of the government’s edict, set fire to his oil wells and retired.
Months later, the situation in Colorado continues to deteriorate. With the Wyatt oil wells out of business, the economy struggles. Several of the other major industrialists have retired and disappeared; nobody knows where they’ve gone. Dagny is forced to cut trains on the Colorado schedule. The one bright spot of her work is her continued search for the inventor of the motor. She speaks to Robert Stadler who recommends a young scientist, Quentin Daniels of the Utah Institute of Technology, as a man capable of undertaking the motor’s reconstruction.
The State Science Institute orders 10,000 tons of Rearden Metal for a top-secret project, but Rearden refuses to sell it to them. Rearden sells to Ken Danagger, the country’s best producer of coal, an amount of Rearden Metal that the law deems illegal. Meanwhile, at the reception for James Taggart’s wedding, Francisco d’Anconia publicly defends the morality of producing wealth. Rearden overhears what Francisco says and finds himself increasingly drawn to this supposedly worthless playboy. The day following the reception, Rearden’s wife discovers that he’s having an affair, but she doesn’t know with whom. A manipulator who seeks control over her husband, Lillian uses guilt as a weapon against him.
Dr. Ferris of the State Science Institute tells Rearden that he knows of the illegal sale to Ken Danagger and will take Rearden to trial if he refuses to sell the Institute the metal it needs. Rearden refuses, and the government brings charges against himself and Danagger. Dagny, in the meantime, has become convinced that a destroyer is loose in the world—some evil creature that is deliberately luring away the brains of the world for a purpose she cannot understand. Her diligent assistant, Eddie Willers, knows that Dagny’s fears are justified. He eats his meals in the workers’ cafeteria, where he has befriended a nameless worker. Eddie tells the worker about Dagny’s fear that Danagger is next in line for the destroyer—that he’ll be the next to retire and disappear. Dagny races to Pittsburgh to meet with Danagger to convince him to stay, but she’s too late. Someone has already met with Danagger and convinced him to retire. In a mood of joyous serenity, Danagger tells Dagny that nothing could convince him to remain. The next day, he disappears.
Francisco visits Rearden and empathizes with the pain he has endured because of the invention of Rearden Metal. Francisco begins to ask Rearden what could make such suffering worthwhile when an accident strikes one of Rearden’s furnaces. Francisco and Rearden race to the scene and work arduously to make the necessary repairs. Afterward, when Rearden asks him to finish his question, Francisco says that he knows the answer and departs.
