A stroll across Chattanooga's Walnut Street bridge -- one of the longest pedestrian bridges in the world -- introduces Roadshow's discussion of carved, wooden folk-art walking canes. Appraisal highlights: an heirloom 18th-century Chippendale tall chest; an "8-ball" presented to Harry Truman in 1948 by the L.A. Press Club; and a pristine Lionel train set, ca. 1930, valued at $2,500 to $3,000.