Once a streetcar line owned by the Brooklyn–Manhattan Transit Corporation, it was replaced on April 26, 1950 by the B55 bus route.

[6] On December 11, 1988, the bus was relabeled as the Q55 Myrtle Avenue (East) bus route (as opposed to the B54 route on the western portion of Myrtle Avenue), operated by the New York City Transit Authority.

[3] The Q55 begins at the Ridgewood Intermodal Terminal at the Myrtle–Wyckoff Avenues Subway station on the Brooklyn-Queens border.

Because of circumstances facing service to the 121st Street station, the Jamaica Avenue terminal was retained.

[20] On January 29, 2025, the current plan was approved by the MTA Board, and the Queens Bus Redesign will go into effect by Labor Day.