List of unused or defunct New York City Subway services
Unused letters[change | change source]
- : the letter I could be confused with Line 1.
- : the letter O could be confused with the number 0, which the MTA uses to help their computers recognize the 42nd Street Shuttle.
- : the letter P could sound funny or rude, because it sounds like the word “pee”.
- : the letter U could be confused with with the word “you”.
- : the letter Y could be confused with with the word “why”.
Internal numbers and letters[change | change source]
The MTA privately (or internally) uses the number 0 and the letter H, to help their computers recognize the three separate shuttles. The three shuttles use the letter S on maps and posters, and this can confuse computers.
- : The number 0 represents the 42nd Street Shuttle.
- : The letter H represents the Rockaway Park Shuttle. The last time that the MTA used the letter H on maps and posters was in 2012, because the damage from Hurricane Sandy prevented the MTA from running Line A.
Reserved letters[change | change source]
The MTA reserves the letters T and X to identify the services that they want to build or run in the future.
- : the letter T represents a service that the MTA plans to run, when they finish building the Second Avenue Subway.
- : the letter X represents a service that the MTA plans to run in the future, but have not decided on what number or letter to use.
Defunct letters and numbers[change | change source]
- : the number 8 used to represent trains that ran on the IRT Third Avenue Line. Line 8 stopped running on April 28, 1973, when the MTA closed the Third Avenue Line.
- : the number 9 used to represent trains that made fewer stops along the same route as Line 1. Line 9 stopped running on May 27, 2005, because it caused riders to wait too long for other trains on the IRT Broadway - Seventh Avenue Line.
- : the letter K used to represent trains that ran via the IND Eighth Avenue Line, between 168th Street and World Trade Center. Line K stopped running on December 11, 1988.
- : the letter V used to represent trains that ran via the IND Sixth Avenue Line, between Forest Hills–71st Avenue and Lower East Side–Second Avenue. Line V stopped running on June 25, 2010, because the MTA did not have enough money to operate the service.
Unused or defunct letters and numbers on trains[change | change source]
- : Trains of the R62 and R62A type can display the numbers 8, 10, 11, 12, and 13. When the trains first entered service, the MTA was thinking of replacing diamond-shaped symbols with separate numbers to represent fast trains.
- : Trains of the R32 and R32A type can display the letters P, T, U, X, and Y. The extra letters allow the MTA to use any of those letters for a special service, during an emergency.
Trains of the R142, R143, R160, R179 and R188 types use digital displays, meaning that they can easily display any service number or letter.