"It's a Train and a Comedy!"
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.
Jack Hopkins

Kathy Fisher

Miriam Fisher

Paul Fisher

Admiral Sir Digby Trevelyan

Sir Giles Thompson

Lord Upshott

Nellie Trotter

Humphrey Gore-Brown

Vicar

Fred Trotter

Mrs. Webb

Harry Markham

Bill

Sid Ludge

Sidney Webb

Albert - Village Constable
Charlie

Thompson's Salesman
Thompson's Salesman

Senior Rally Steward

Rally Commentator (voice)
Mrs. Webb's Teammate

'Wrong' Rolls Royce Owner
Concierge

Rally Steward

Unknown Role

Unknown Role
Race Starter

Unknown Role
Actor
Unknown Role
Fred's Son

Himself
Rally Steward (uncredited)
Steam Rally Spectator (uncredited)