The MTA's "Fastrack" has been up and running for a year now, and there are currently plans to expand this to the Bronx, Queens, and Upper Manhattan in 2013.

"Over the past year we have found this to be an extremely effective way to maintain a subway system that operates around the clock, seven days a week," said NYCT President Thomas F. Prendergast.

Below, you'll find a list of tracks that will be experiencing heavy maintenance in the future:

the Broadway NQR south of Queensboro Plaza to Court Street

the A Line between 168th Street and 207th Street, in upper Manhattan

the Concourse Line D between 161st and 205th Streets

the Queens Boulevard Line EFMR between 5th Av/53rd Street and Roosevelt Avenue

the Lexington Avenue Local 6 between 45th and 100th Streets

the Lexington Avenue Express 45 between 45th and 100th Streets

the Sixth/Eighth Avenue Lines ABCD between 59th-Columbus Circle and 168th-Broadway and 161st -River Avenue

Nassau Street-Broad Street-Essex St J

the Fourth Avenue Line between 36th and 95th Streets D NR

and the 2 along Nostrand Avenue south of Franklin Avenue.

[via Gothamist]