The Narrow Margin

The Narrow Margin is a tight, economical thriller which constricts its action almost entirely to a train. The hard-boiled, snub-nosed police detective Brown (Charles McGraw) is enlisted along with his partner to pick up the widow (Marie Windsor) of murdered gangster Frankie Neall, escorting her from Chicago to Los Angeles through a likely hail of bullets in order to testify before a grand jury