From Longman Dictionary of Contemporary Englishpicture railˈpicture rail noun [countable] British English DHa long narrow piece of wood fixed high on a wall, used for hanging pictures from
Examples from the Corpus
picture rail• A shelf for decorative plates running at picture rail height will instantly bring an interior to life.• Other interesting features of this room are the brass pots and pans that hang from a brass picture rail.• A festive sprig or two round the picture rail? 