89th Street was a station on the demolished IRT Third Avenue Line

IRT Third Avenue Line

The IRT Third Avenue Line, commonly known as the Third Avenue El, was an elevated railway in Manhattan and the Bronx, New York City. Originally operated by an independent railway company, it was acquired by the Interborough Rapid Transit Company and eventually became part of the New York subway...

. It had two levels. The lower level, built first, was served by local trains and had two tracks and two side platform

Side platform

A Side platform is a platform positioned to the side of a pair of tracks at a railway station, a tram stop or a transitway. A pair of side platforms are often provided on a dual track line with a single side platform being sufficient for a single track line...

s. The upper level was built as part of the Dual Contracts, had one track for express trains. The next stop to the north was 99th Street

99th Street (IRT Third Avenue Line)

99th Street was a station on the demolished IRT Third Avenue Line in New York City. It had two levels. The lower level serving local trains was built first, and had two tracks and two side platforms. The upper level, built as part of the Dual Contracts had one track for express trains. The next...

. The next stop to the south was 84th Street

84th Street (IRT Third Avenue Line)

84th Street was a station on the demolished IRT Third Avenue Line. It had two levels. The lower level was built first and had two tracks and two side platforms. It was served by local trains. The upper level was built as part of the Dual Contracts and had one track for express trains. The next...

. The station closed on May 12, 1955. North of the station were connecting tracks to the 98th Street Yard.