IRT Third Avenue Line
（重定向自Third Avenue El）
![A Third Avenue Line train passes Cooper Square in the 1950s, with the Empire State Building in the background.](/Images/godic/202502/16/Third_Ave_El_-_10632.jpg")
![The Third Avenue El over the Bowery in the 1890s.](/Images/godic/202502/16/Bowery,_New_York_City,_ca._18980632.jpg")
![1917 postcard](/Images/godic/202502/16/Bowery_and_DoubleDeck_Elevated,_New_York_City0632.png")
![84th Street station of the Third Avenue El in September 1942](/Images/godic/202502/16/94th_Street._Station_of_the_Third_Avenue_8d22268v0632.jpg")
The IRT Third Avenue Line, commonly known as the Third Avenue El and the Bronx El, was an elevated railway in Manhattan and the Bronx, New York City. Originally operated by an independent railway company, it was acquired by the Interborough Rapid Transit Company (IRT) and eventually became part of the New York subway system.