Sonja repairs trains and wagons and has recently been abandoned by her husband. Now she wants to concentrate on her career, which she tells Kenneth, her colleague. New at the work place is the "engine-driver" with an obscure past. Sonja is fascinated with this man and his mysterious façade.

Sonja repara trenes y vagones y recientemente ha sido abandonada por su marido. Ahora quiere concentrarse en su carrera, lo que le dice a Kenneth, su colega. Nuevo en el lugar de trabajo es el "motor conductor" con un pasado oscuro. Sonja está fascinada con este hombre y su misteriosa fachada.