| Interborough Rapid Transit Company | |
|---|---|
 | |
| Overview | |
| Status | Incorporated into the New York City Subway |
| Owner | City of New York |
| Service | |
| Type | Underground and above-ground metro |
| Operator(s) | New York City Transit Authority |
| Depot(s) | 239th Street Yard, 240th Street Yard, Corona Yard, East 180th Street Yard, Jerome Yard, Livonia Yard, Westchester Yard |
| Rolling stock | R62, R62A, R142, R142A, R188 |
| History | |
| Opened | 1904 (acquisition of the Manhattan Railway Company) |
| Closed | 1940 (acquisition by the NYC Board of Transportation) |
| Technical | |
| Track gauge | 4 ft 8+1⁄2 in (1,435 mm) standard gauge |
| Minimum radius | 147.25 ft (44.88 m)[1] |
The Interborough Rapid Transit Company (IRT) was the private operator of New York City's original underground subway line that opened in 1904, as well as earlier elevated railways and additional rapid transit lines in New York City.[2] The IRT was purchased by the city on June 12, 1940, along with the younger BMT and IND systems, to form the modern New York City Subway. The former IRT lines (the numbered routes in the current subway system) are now the A Division or IRT Division of the Subway.
- ^ "NYC Minimum Curve Radius". Archived from the original on March 18, 2012.
- ^ "About New York; Alphabet Soup: Telling an IRT From a BMT". The New York Times. June 30, 1990. Retrieved March 14, 2016.