IRT Division Timeline
From nycsubway.org
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| Section | Mileage | Tracks | Date Opened |
|---|---|---|---|
| Details coming soon. | |||
| City Hall/Brooklyn Bridge - Grand Central | 1 (City Hall Loop); 4 | 10/27/1904 | |
| Grand Central - 125th St. | 1918 | ||
| |||
| Section | Mileage | Tracks | Date Opened |
| South Ferry - Penn Station | 1 (South Ferry Loop); 4 | 7/1/1918 | |
| Penn Station - Times Square | 4 | 6/3/1917 | |
| Times Square - 145th St. | 4/3 | 10/27/1904 | |
| 145th to 157th | 3 | 11/12/1904 | |
| 157th to 215th | 3 | 3/12/1906 | |
| 215th to 225th (Broadway Bridge) | 3 | 1/14/1907 | |
| 225th to 242nd | 3 | 8/1/1908 | |
| |||
| Section | Mileage | Tracks | Date Opened |
| Chambers to Wall | 0.8 | 2 | 7/1/1918 |
| Wall to Borough Hall | 1.5 | 2 | 4/15/1919 |
| Brooklyn Bridge to Fulton | 0.3 | 4/2 | 1/16/1905 |
| Fulton to Wall | 0.2 | 2 | 6/12/1905 |
| Wall to South Ferry (inner loop) (including Bowling Green) | 0.5 | 2/1 | 7/10/1905 |
| Bowling Green to Borough Hall | 1.6 | 2 | 1/9/1908 |
| Borough Hall to Atlantic | 0.9 | 4 | 5/1/1908 |
| Atlantic to Utica | 2.8 | 4 | 8/23/1920 |
| Utica to Junius Street | 1.9 | 2 | 11/22/1920 |
| Junius to Pennsylvania | 0.4 | 2 | 12/24/1920 |
| Pennsylvania Ave to New Lots Ave | 0.6 | 2 | 10/16/1922 |
| Franklin Ave to Flatbush Ave | 3.0 | 2 | 8/23/1920 |
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| Section | Mileage | Tracks | Date Opened |
| Broadway and 96 to Lenox and 145 | 3.0 | 2-3 | 11/23/1904 |
| Lenox and 145 to Lenox and 148 | 0.3 | 2 | 05/13/1968 |
| Lenox and 135 to Jackson Ave. | 1.1 | 2-3 | 07/10/1905 |
| 149 and 3rd Ave. El to 180-Bronx Park | 3.2 | 3 | 11/26/1904 |
| 177th to 219th | 3.4 | 3 | 03/03/1917 |
| 219th to 238th | 1.1 | 3 | 03/31/1917 |
| 238th to 241st | 0.4 | 3-2 | 12/13/1920 |
| 125th/Lex to 138th/3rd Av | 0.9 | 2 | 8/1/1918 |
| 138th/3rd Ave to Hunts Point | 2.5 | 3 | 1/8/1919 |
| Hunts Point to 177th | 2.0 | 3 | 5/30/1920 |
| 177th to Westchester Square | 1.1 | 3 | 10/24/1920 |
| Westchester Square to Pelham Bay Park | 1.3 | 3 | 12/20/1920 |
| Woodlawn to Kingsbridge | 1.7 | 2/3 | 6/12/1917 |
| Kingsbridge to 149th | 3.8 | 3 | 7/12/1917 |
| 149th to 138th | 0.4 | 3 | 7/17/1918 |
| 138th to 125th | 0.7 | 3/2 | 7/17/1918 |
| |||
| Section | Mileage | Tracks | Date Opened |
| Grand Central - Vernon/Jackson | 2 | 6/22/15 | |
| Vernon/Jackson - Hunters Point Ave | 2 | 2/15/16 | |
| Hunters Point Ave - Queensboro Plaza | 2 | 11/05/16 | |
| Queensboro Plaza - 103rd St | 2/3 | 4/21/17 | |
| 103rd St - 111th St | 3 | 10/13/25 | |
| Grand Central - 5th Avenue | 2 | 3/22/26 | |
| 5th Avenue - Times Square | 2 | 3/14/27 | |
| 111th St - Willets Pt. Blvd | 3 mainline + yard leads | 5/14/27 | |
| Willets Pt. Blvd - Main Street | 3/2 | 1/21/28 | |