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“The Oxford Companion to Food” says the club — also called a clubhouse sandwich — was sometimes served as a three-decker sandwich, adding: “Some believe that it was originally only a two-decker, perhaps, matching the two-decker ‘club cars’ running on U.S. railroads in 1895.”

In response, McDonald’s unveiled a more traditional Bacon Clubhouse sandwich this week, available as beef or chicken topped with lettuce and a thick slice of tomato.