Willy Birgel as Rudolf Diesel

Hilde Weissner as Martha Diesel, seine Frau

Paul Wegener as Direktor Buz

Josef Sieber as Martin

Arthur Schröder as Lucien Vogel

Erich Ponto as Theodor Diesel

Hilde von Stolz as Frau von Lorrenz

Hubert von Meyerinck as Herr von Lorrenz

Werner Pledath as Prof. Linde

Herbert Gernot as Krumper

Walter Janssen as Prof. Barnickel

Karl-Heinz Peters as Ingenieur Scheuermann

Heinrich Marlow as Prof. Lüders

Heinrich Troxbömker as Krupp

Albert Florath as Arzt

Paul Westermeier as Fleischermeister

Franz Arzdorf as Führer im Maschinenpavillon

Roma Bahn as Segelschiff-Passagierin

Leo Peukert as alter Schlepperkapitän

Eduard Wenck as Schiffsheizer

Viggo Larsen as Ein Professor

Hermann Pfeiffer as