|Underground New York Public Library|
Books sighted span the gamut — Alexandre Dumas and Jules Verne, Stephen King and George RR Martin, Umberto Eco and Stefan Zweig. Also poetry and nonfiction. The larger point is that metro riders are reading real books, as opposed to, I guess, more disposable material.
It should be noted that Montreal's main metro hub is situated beneath the Grande Bibliothèque.
Books that have made people miss their stop: The Hunger Games (poll winner by a wide margin), The Count of Monte Cristo, Life of Pi. You?
See also Underground New York Public Library.