The film follows Jack Hopkins, an aircraft designer with a passion for traction engines. His boss is eager to sell a new supersonic jet plane that Jack has designed to American millionaire Paul Fisher. The first encounter between Fisher and Jack goes badly, and tensions only heighten after Fisher's daughter Kathy damages Jack's prize traction engine "The Iron Maiden", rendering it impossible to drive solo. Jack is desperate to enter the annual Woburn Abbey steam rally with the machine, but his fireman is injured and unable to participate. When all seems lost the millionaire himself is won over by Jack's plight and joins him in driving the engine; the two soon become firm friends.
The Iron Maiden is a 1963 British comedy film. The film was directed by Gerald Thomas, and stars Michael Craig, Anne Helm, Jeff Donnell and Alan Hale Jr. There are minor roles for Carry On stalwarts Jim Dale and Joan Sims, and the veteran actor Sam Kydd also appears with his then six-year-old son Jonathan Kydd. The film is known as The Swinging Maiden in America.