In the current (10/27/14) New Yorker, an entertaining “Where Are They Now Dept.” feature by Michael Schulman, “Underground Beauties”, beginning:
Long before Dr. Zizmor and Poetry in Motion, beauty on the subways came in the form of the Miss Subways competition, which ran from 1941 to 1976. The idea, hatched by the New York Subways Advertising Company, was to prettify the train cars while drawing eye traffic to the surrounding ads for chewing gum or cigarettes. Every few months, a new glamour shot would appear on posters underground, along with a few lines describing the winner’s hobbies (“modern dance, piano and ceramics”) and aspirations (“plugging for B.A. but would settle for M.R.S.”). Nearly two hundred women claimed the title.
Over the years, nearly two hundred women served as Miss Subways. So there were nearly two hundred Miss Subwayses? No that can’t be right: Subways is already plural. The obvious solution is a zero plural, with only one realization of plural inflection: nearly two hundred Miss Subways. And that’s the solution in the New Yorker piece.