H was the last of the letters assigned to original routes of the Independent Subway System of the New York City Subway in the 1930s. It was designated as the dedicated service letter of the IND Fulton Street Line in Brooklyn. During the mid-1980s and early 1990s, the Rockaway Park Shuttle train between Euclid Avenue and Broad Channel was denoted as the H and featured a white "H" on a blue background, similar to that of the A, C or E. Today, the H designation is not in external use, but is used internally when the Metropolitan Transportation Authority refers to the Rockaway Park Shuttle.