9 (New York City Subway service)
Dyre Avenue Line (1941–1966) 
|This section does not cite any references or sources. (July 2008)|
The 9 designation was originally used for the IRT Dyre Avenue Line upon its opening in 1941 between Dyre Avenue and the East 180th Street platforms of the former New York, Westchester and Boston Railway, connecting to the IRT White Plains Road Line at the latter station. When a connection between the Dyre Avenue Line and the White Plains Road Line opened in 1957, daytime shuttle service was replaced with through service as the 2. From 1957 till 1966, the nighttime Dyre Avenue Shuttle continued to use the number 9. Since 1967, the Dyre Avenue Shuttle runs during late night hours, but now carries the number 5, the same as the through service on the line.
Broadway – Seventh Avenue Line skip-stop service (1989–2005) 
The second and most recent usage of the 9 designation was a skip-stop service to complement the 1 local train on the IRT Broadway – Seventh Avenue Line as the 9 Broadway – Seventh Avenue Line Local. Beginning at 6:30 AM on Monday, August 21, 1989, the services were coordinated as the 1/9 and both ran between Van Cortlandt Park – 242nd Street and South Ferry. The skip-stop operation was north of 137th Street.
and the following stations to the 9 train only:
After the September 11, 2001 attacks, 1 trains had to be rerouted since the IRT Broadway – Seventh Avenue Line ran directly under the World Trade Center site and was heavily damaged in the collapse of the Twin Towers. The 1 ran only between Van Cortlandt Park – 242nd Street and 14th Street, running local north of 96th Street and express south of there; the 9 service and skip-stop service were suspended at this time. 1 trains returned to South Ferry, and skip-stop service was restored on September 15, 2002.
As a result of a decrease in the number of riders benefiting from the 9 and skip-stop services, the MTA announced their elimination in mid-2004 and approved it in early 2005. The last 9 train ran on May 27, 2005 and the 1 now makes all stops on the IRT Broadway-Seventh Line.
Route Pattern 
|Station service legend|
|Stops all times|
|Stops all times except late nights|
|Stops late nights only|
|Stops weekdays only|
|Stops rush hours only|
|Stops rush hours in the peak direction only|
|Time period details|
- "The New York City Transit Authority in the 1980s". nycsubway.org.
- Chan, Sewell (January 12, 2005). "MTA Proposes Dropping No. 9 Train". The New York Times. Retrieved 2010-03-04.
- Lueck, Thomas J. (September 15, 2002). "Old Service, Old Stops Restored on West Side". The New York Times. Retrieved 2010-03-04.
- Chan, Sewell (May 25, 2005). "On Its Last Wheels, No. 9 Line Is Vanishing on Signs". The New York Times. Retrieved 2007-09-30.
|Wikinews has related news: New York City Subway's skip-stop 9 service to make its last run May 27|