The film starts from childhood with the story of three friends Ashok (Dharmendra), Vinod (Vinod Khanna) and Randhir (Danny Denzongpa). Ashok is a son of wealthy industrialist Seth Dharmdas (Madan Puri) and he is passionate about the fastest moving cars, whereas Vinod and Randhir work as engineers in India Railway Board along with another friend Rakesh (Vinod Mehra), all of them have only one dream from childhood; to make the fastest moving train in India. Randhir is a short-tempered and angry person, from childhood, who has a habit of destroying something if he is not able to achieve it. Randhir is always jealous of the success of Vinod, he is in a tussle from childhood to make a better train than Vinod. Meanwhile, Ashok and Vinod fall in love with two beautiful women: Seema (Hema Malini) and Sheetal (Parveen Babi). Randhir also loves Sheetal, but she marries Vinod and they have a child, Raju, which hurts Randhir a lot. Ashok and Seema are planning to get married after their engagement, but suddenly Ashok's father faces heavy bankruptcy, loses his property and commits suicide. Ashok comes onto the road and even Seema leaves him; heartbroken, Ashok leaves town.