The Broadway–Seventh Avenue Line, also known as the West Side Line, is one of the lines of the IRT division of the New York City Subway. It runs along the west side of Manhattan and into the Bronx; the part north of 42nd Street was built as part of the first subway in New York. The line serves places such as Lincoln Center, Columbia University, and the City College of New York. The line is often referred to as the 1–2–3, since the 1, 2, and 3 services operate together over much of the line. The line sees 3 service limited rush hours in the peak direction (two trains heading to Brooklyn and four trains heading to the Bronx) to clear congestion. In the past, the 1 operated as a skip-stop service in tandem with the 3, which was discontinued after May 27, 2005; this skip-stop service existed o