Wonderful suspense buildup. Well-done integration of actual Nazi footage. The rinky-dink miniature sets for outdoor longshots were a hoot! Okay, so the Brits didn't have a lot of money for fancy sound stages. The real highlight is watching Paul Henreid take on his Gestapo agent role with smooth relish. Just a few years before, he had been effectively blacklisted from German-language films for not signing up with the Nazi Actors' Guild. This role won him an award, and was much more interesting a part than that of Victor Laszlo in "Casablanca". Rex Harrison was overall good, but at times a little too "cute", as were the two Englishmen on the train.