The Narrow Margin A Fortune If They Seal Her Lips!...A Bullet If They Fail! A tough cop meets his match when he has to guard a gangster's widow on a train journey from Chicago to Los Angeles. Details Casts Title The Narrow Margin Release Date 1952-05-03 Runtime 01 Hours 11 Minutes Genres Thriller Crime Production Companies RKO Radio Pictures Production Countries United States of America Charles McGraw Det. Sgt. Walter Brown Marie Windsor Mrs. Frankie Neall Jacqueline White Ann Sinclair Gordon Gebert Tommy Sinclair Queenie Leonard Mrs. Troll David Clarke Joseph Kemp Peter Virgo Densel Don Beddoe Det. Sgt. Gus Forbes Paul Maxey Sam Jennings Harry Harvey Train Conductor Peter Brocco Vincent Yost (uncredited) George Chandler Accomplice Running Newss? Franklyn Farnum Train Passenger (uncredi? Don Haggerty Det. Wilson (uncredited) Milton Kibbee Tenant (uncredited) Walter Merrill Officer Allen (uncredite? Harold Miller Train Passenger (uncredi? Bess Flowers Restaurant Diner (uncred?