The Archer Avenue lines are two rapid transit lines of the New York City Subway, mostly running under Archer Avenue in the Jamaica neighborhood of Queens. The two lines are built on separate levels: trains from the IND Queens Boulevard Line () serve the upper level, and trains from the BMT Jamaica Line () serve the lower. The two lines are separate, and do not share track connections, and therefore have different chainings and radio frequencies. The B2 (IND Division) Archer Avenue line uses the upper level, and the B1 (BMT Division) Archer Avenue line uses the lower level. These lines were conceived as part of the Metropolitan Transportation Authority (MTA)'s 1968 expansion plans, and along with the 63rd Street lines and a small section of the Second Avenue Subway, they were the only portions of the plan to be completed before it was scaled back due to fiscal issues. These lines were originally planned to be extended further east into Queens. Construction on the line started in 1973, and the project was expected to be completed in 1980. However, due to financial issues and concern about the quality of the construction, the lines did not open until December 11, 1988. On that date, several bus routes serving the 169th Street station were diverted to the new bus terminal at Jamaica Center. This line is also used by passengers transferring to or from the Long Island Rail Road and the AirTrain JFK. Extent and service The following services use the Archer Avenue lines: The two Archer Avenue lines begin at a northern (geographic eastern) terminal, Jamaica Center–Parsons/Archer (), as a bi-level subway, each level having two tracks. The upper level is used by the B2 (IND Division) Archer Avenue line, and uses IND radio frequencies, while the lower level is used by the B1 (BMT Division) Archer Avenue line, and uses BMT radio frequencies. The two lines run compass west along Archer Avenue to another station at Sutphin Boulevard–Archer Avenue–JFK Airport, where connections can be made to the Long Island Rail Road and AirTrain JFK. West of this station, the two levels diverge. The lower level tracks () continue roughly compass northwest, emerging from a portal near 89th Road and 130th Street and paralleling the Main Line of the LIRR before turning west onto the elevated structure of the BMT Jamaica Line at about 127th Street. The upper level tracks