general/defunct-new-york-city-subway-lines
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IRT Second Avenue Line
Former New York City rapid transit line
IRT Sixth Avenue Line
Former New York City rapid transit line
Fifth Avenue Line (Brooklyn elevated)
Former New York City rapid transit line
BMT Lexington Avenue Line
Former New York City rapid transit line
IRT Ninth Avenue Line
Former New York City rapid transit line
Fulton Street Line (elevated)
Former New York City rapid transit line
IND World's Fair Line
New York City Subway line (1939–40)