The Metropolitan Transportation Authority's Fastrack repair program comes to the N, Q and R lines this week.
There will be no service in Manhattan from 10 p.m. to 5 a.m. between Monday night to Friday morning, while maintenance crews make repairs.
N trains will still run in Brooklyn and Queens.
Q trains will run as usual in Brooklyn and on the D line in Manhattan.
There will be an R line shuttle between 95th Street and 36th Street in Brooklyn all night.
Travel alternatives include the M, E or 7 lines in Queens, and the 2, 4, D, F or Q lines in Brooklyn.
For information on travel alternatives, visit mta.info.