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Previously it was used by the IRT to designate their route that used the Astoria Line, which was originally jointly operated with the BMT prior to 1949. Additionally, it appears on the rollsigns of some trains as a green 8. [1] 9 was last used for skip-stop service on the IRT Broadway–Seventh Avenue Line from 1989 to 2005. [2]
The New York City Subway system has, for the most part, used block signaling since its 1904 opening. As of May 2014, the system consists of about 14,850 signal blocks, 3,538 mainline switches, 183 major track junctions, 10,104 automatic train stops, and 339,191 signal relays. [2]
IRT Jerome Avenue Line: Single center track between 149th Street–Grand Concourse and Woodlawn. Some northbound 4 trains in the morning and afternoon rush hours operate express from 167th Street until Burnside Avenue, where they short-turn. IRT White Plains Road Line: Single center track between East 180th Street and Wakefield–241st Street.
Letter Old number Line J: 15: Jamaica Line (express) K: 14: Broadway–Brooklyn Line to Canarsie Line or Jamaica Line (local) L: 16: Canarsie Line via 14th Street M: 10: Myrtle Avenue Line from Lower Manhattan MJ: 11: Myrtle Avenue Line from Downtown Brooklyn N: 4: Sea Beach Line: Q: 1: Brighton Beach Line: R: 2: Fourth Avenue Line: T: 3: West ...
It became known as the IND after unification of the subway lines in 1940; the name IND was assigned to match the three-letter initialisms that the IRT and BMT used. [1] The first IND line was the Eighth Avenue Line in Manhattan, opened on September 10, 1932; for a while the whole system was colloquially known as the Eighth Avenue Subway.
The IRT Powerhouse An old IRT sign remains at Wall Street station. 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]
A three-way switch is used to split a railroad track into three divergent paths rather than the more usual two. There are two types of three-way switches. In a symmetrical three-way switch, the left and right branches diverge at the same place. In an asymmetrical three-way switch, the branches diverge in a staggered way using two interlaced ...
The IRT Dyre Avenue Line (formerly the IND Dyre Avenue–East 174th Street Line) is a New York City Subway rapid transit line, part of the A Division. It is a branch of the IRT White Plains Road Line in the northeastern section of the Bronx , north of East 180th Street .