It was designated as the dedicated service letter of the IND Fulton Street Line in Brooklyn.
Express service on the four-track line was to be provided by trains coming from Jay Street–Borough Hall and Manhattan.
The HH ran on weekdays and Saturday from 7 a.m. to 7 p.m.[1] At that latter station, it stopped at the outermost tracks and platforms and connections to the Fulton Street and Crosstown trains were available.
Since the two stations the HH served were just three blocks apart in distance, it was discontinued on June 1, 1946, at 7 p.m.[2] Since then, the two outermost tracks at Hoyt–Schermerhorn Streets have not been used in revenue service.
The tracks leading to the station from the IND Fulton Street Line are still operable and used to move trains to and from the exhibit.