Service as the AA

A and AA service began on September 10, 1932 with the opening of the IND Eighth Avenue Line. The Independent Subway System (IND) used single letters to refer to express services and double letters for local services. The A ran express and the AA ran local, from 168th Street to Hudson Terminal (now World Trade Center). The AA ran at all times, and it was extended to 207th Street during nights and on Sundays when the A did not run. When the Eighth Avenue Line was extended to Jay Street–Borough Hall on February 1, 1933 the AA was extended there evenings and Sundays, when the A did not run.^[1][2]

On July 1, 1933, the AA was suspended when the Concourse Line opened and the new CC service provided local service on Eighth Avenue in its place. A service began running express in Manhattan at all times. AA service was restored as part of changes made in conjunction with the opening of the IND Sixth Avenue Line on December 15, 1940. The AA would only run during non-rush hours and Saturday late afternoon through all day Sunday service to Chambers Street. Rush hours, which at the time included Saturday mornings and afternoons, the AA did not run; it was replaced by the BB (later B) service, which instead ran on the Sixth Avenue Line.^[3] On January 5, 1952, AA service began operating during Saturday mornings and afternoons, replacing BB service.^[2] This pattern was unchanged until August 28, 1977, when late night service was replaced by an all local A service.^[1][4]

Service as the K

On May 6, 1985, as part of the elimination of double letters, the AA was renamed the K. This service operated between 168th Street and World Trade Center during midday, evenings, and weekends. During late night hours, the A express made local stops on the Eighth Avenue Line. During rush hours, the C, formerly the CC, ran between Bedford Park Boulevard and Rockaway Park–Beach 116th Street, replacing the K as the local on Eighth Avenue.^[5] This change was not officially reflected in schedules until May 24, 1987.^[1]

On December 11, 1988, as part of the widespread service changes that day, the K was discontinued, being replaced by the C train, which was expanded from its rush-hour only service to include midday service between 145th Street and Euclid Avenue, early evening (until 9 p.m.) service from 145th Street to World Trade Center, and weekend service matching the former K between 168th Street and World Trade Center.^[6] The B was also expanded to middays to match part of the former K.^[7][1]

Service pattern

The following table shows the lines used by the K service:

Stations

For a more detailed station listing, see the articles on the lines listed above.

More information Station service legend ...

Station service legend
	Stops all times
	Stops all times except late nights
	Stops weekdays during the day
	Stops weekdays in the peak direction only
Time period details
	Station is compliant with the Americans with Disabilities Act
↑	Station is compliant with the Americans with Disabilities Act in the indicated direction only
↓
	Elevator access to mezzanine only

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More information Stations, Subway transfers ...

	Stations		Subway transfers	Connections
Manhattan
	168th Street
	163rd Street–Amsterdam Avenue
	155th Street
	145th Street		A  D  (IND Concourse Line)
	135th Street
	125th Street		A D
	116th Street
	Cathedral Parkway–110th Street
	103rd Street
	96th Street
	86th Street
	81st Street–Museum of Natural History
	72nd Street
	59th Street–Columbus Circle		A  D  1  (IRT Broadway–Seventh Avenue Line)
	50th Street		E
	42nd Street–Port Authority Bus Terminal		A  ​​E  1  ​2  ​3  (IRT Broadway–Seventh Avenue Line), 7  <7> ​ (IRT Flushing Line), B  D  N  Q  R  (BMT Broadway Line), S (42nd Street Shuttle) at Times Square–42nd Street	Port Authority Bus Terminal Note: Yellow B and D services discontinued
	34th Street–Penn Station		A  ​​E	Amtrak, LIRR, NJ Transit at Pennsylvania Station
	23rd Street		E
	14th Street		A  ​​E  L  (BMT Canarsie Line)
	West Fourth Street–Washington Square		A  ​​E  F  <F> S JFK (IND Sixth Avenue Line)	PATH at Ninth Street Note: Grand Street Shuttle and JFK Express discontinued
	Spring Street		E
	Canal Street		A  ​​E
	World Trade Center		E  A  (IND Eighth Avenue Line at Chambers Street) 2  ​3  (IRT Broadway–Seventh Avenue Line at Park Place)	PATH at World Trade Center

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