Interborough Rapid Transit Company

Interborough Rapid Transit Company
300px IRT Lo-Voltage motor cars at Mosholu Parkway station
Overview
Type	Underground and above-ground metro
Status	In operation
Services	8
Operation
Opened	1904 (1904)
Closed	1940 (1940) (acquisition by the NYC Board of Transportation)
Owner	City of New York
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
Technical
Track gauge	4 ft 8 1⁄2 in (1,435 mm)
Minimum radius	147.25 ft (44.88 m)

File:W58th St IRT power jeh.JPG

IRT Powerhouse

File:Wall Street IRT Subway Sign.JPG

An old IRT sign remains at Wall Street station.

The Interborough Rapid Transit Company (IRT) was the private operator of the original underground New York City Subway line that opened in 1904, as well as earlier elevated railways and additional rapid transit lines in New York City. The IRT was purchased by the City in June 1940. The former IRT lines (the numbered lines in the current subway system) are now the A Division or IRT Division of the Subway.

History

The first IRT subway ran between City Hall and 145th Street at Broadway, opening on October 27, 1904. It opened following more than twenty years of public debate on the merits of subways versus the existing elevated rail system and on various proposed routes.

Founded on May 6, 1902, by August Belmont, Jr., the IRT's mission was to operate New York City's initial underground rapid transit system after Belmont's and John B. McDonald's Rapid Transit Construction Company was awarded the rights to build the railway line in 1900, outbidding Andrew Onderdonk. On April 1, 1903, over a year before its first subway line opened, the IRT acquired the pre-existing elevated Manhattan Railway by lease, gaining a monopoly on rapid transit in Manhattan. The Manhattan EL was the operator of four elevated railways in Manhattan with an extension into the Bronx. The IRT coordinated some services between what became its subway and elevated divisions, but all the lines of the former Manhattan EL have since been dismantled.

In 1913, as a result of massive expansion in the city, the IRT signed the Dual Contracts with Brooklyn Rapid Transit (BRT) in order to expand the subway.

The IRT ceased to function as a privately held company on June 12, 1940, when its properties and operations were acquired by the City of New York.

Today, the IRT lines are operated as the A Division of the subway. The remaining lines are underground in Manhattan, except for a short stretch across Harlem at 125th Street and in northernmost Manhattan. Its many lines in the Bronx are predominantly elevated, with some subway, and some railroad-style right-of-way acquired from the defunct New York, Westchester and Boston Railway, which now constitutes the IRT Dyre Avenue Line. Its Brooklyn lines are underground with a single elevated extension that reaches up to New Lots Avenue, and the other reaching Flatbush Avenue via the underground Nostrand Avenue Line. The Flushing Line, its sole line in Queens, is entirely elevated except for a short portion approaching its East River tunnel and its terminal at Flushing – Main Street (the whole Manhattan portion of the line is underground). The Flushing Line has had no track connection to the rest of the IRT since 1942, when service on the Second Avenue El was discontinued. It is connected to the BMT and the rest of the system via the BMT Astoria Line on the upper level of the Queensboro Plaza station.

Lines

As built

The Bronx and Manhattan

Trunk lines include:

• Lexington Avenue Line (4  5  6  <6> trains), under Park and Lexington Avenues, as well as under Lafayette Street and Broadway
• Broadway – Seventh Avenue Line (1  2  3  trains), under and over Broadway, as well as under Seventh Avenue, Varick Street, and West Broadway
• Flushing Line (7  <7> trains), under 41st and 42nd Streets
• 42nd Street Line (S  trains), under 42nd Street

Branch lines include:

• Lenox Avenue Line (2  3  trains), under Lenox Avenue and Central Park
• White Plains Road Line (2  5  trains), under East 149th Street, and over Westchester Avenue, Southern Boulevard, Boston Road, and White Plains Road
• Pelham Line (6  <6> trains), under East 138th Street and Southern Boulevard, and over Westchester Avenue
• Jerome Avenue Line (4  trains), under Grand Concourse, over River and Jerome Avenues,

Brooklyn and Queens

There were three Brooklyn lines built by the IRT:

• Eastern Parkway Line (2  3  4  5  trains), under Fulton Street, Flatbush Avenue, and Eastern Parkway
• New Lots Line (2  3  4  5  trains), over East 98th Street and Livonia Avenue
• Nostrand Avenue Line (2  5  trains), under Nostrand Avenue

The only line in Queens is the Flushing Line (7  <7> trains), under 50th Avenue, and over Queens Boulevard and Roosevelt Avenue.

Cross-river crossings

(of the East and Harlem Rivers, from south to north)

• Joralemon Street Tunnel (4  5  trains)
• Clark Street Tunnel (2  3  trains)
• Steinway Tunnel (7  <7> trains)
• Lexington Avenue Tunnel (4  5  6  <6> trains)
• 149th Street Tunnel (2  trains)
• Broadway Bridge (1  trains)

After 1940

• Dyre Avenue Line (5  trains), parallel to the Esplanade, and on the old right-of-way of the New York, Westchester and Boston Railway in 1941
• Flushing Line, on October 16, 1949, the joint BMT/IRT service arrangement ended. The Flushing Line became the responsibility of IRT. The Astoria Line had its platforms shaved back for exclusive BMT operation.
• Lenox Avenue Line to Harlem – 148th Street (2  3  trains), at-grade parallel to 149th Street in 1968
• Broadway–Seventh Avenue Line to new South Ferry island-platformed stations, opened March 16, 2009 and closed temporarily on October 28, 2012
• Flushing Line to 34th Street – Hudson Yards (7 <7> trains), under 41st Street and 11th Avenue, opened September 13, 2015

See also

• History of the IRT subway before 1918
• New York IRT—Soccer team sponsored by IRT
• IRT Rangers—Soccer team sponsored by IRT

External links

• Historic American Engineering Record (HAER) No. NY-122, "Interborough Rapid Transit Subway (Original Line), New York, New York County, NY", 72 photos, 614 data pages, 4 photo caption pages
• Works by Interborough Rapid Transit Company at Project Gutenberg