HH was the last of the letters assigned to original routes of theIndependent Subway System of theNew York City Subway in the 1930s. It was designated as the dedicated service letter of theIND Fulton Street Line inBrooklyn.

The letter was intended to be used for a service running local fromCourt Street, a stub-end station inDowntown Brooklyn, to the futureEuclid Avenue station near the border withQueens. Express service on the four-track line was to be provided by trains coming fromJay Street–Borough Hall and Manhattan.

When service on the Fulton Street Line began on April 9, 1936, all trains serving it ran into Manhattan and the HH ran only as a two-stop shuttle to connect Court Street withHoyt–Schermerhorn Streets. The HH ran on weekdays and Saturdays 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 andCrosstown trains were available.

Because 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 atHoyt–Schermerhorn Streets have not been used in revenue service.

The Court Street station is now the site of theNew York Transit Museum. The tracks leading to the station from theIND Fulton Street Line are still operable and used to move trains to and from the exhibit.

Station service legend
	Stops during weekday daytime hours only
Time period details
	Station is compliant with theAmericans with Disabilities Act
↑	Station is compliant with theAmericans with Disabilities Act in the indicated direction only
↓
	Elevator access to mezzanine only

	Stations	Subway transfers	Notes
Brooklyn
	Court Street		Now site ofNew York Transit Museum.
	Hoyt–Schermerhorn Streets	IND Fulton Street Line IND Crosstown Line

• Line By Line History
• Court St, and Hoyt-Schermerhorns Sts platforms

• Defunct New York City Subway services

• Articles with short description
• Short description matches Wikidata