The MTA's "Fastrack" maintenance program is coming to the 4, 5 and 6 lines for the next two weeks.
From 10 p.m. till 5 a.m., there will be no 4 or 5 trains between Grand Central-42nd Street in Manhattan and Atlantic Avenue Barclays Center in Brooklyn.
The 6 train will not run in Lower Manhattan below Grand Central.
Number 5 train service in Manhattan ends early each night.
The MTA recommends the N, R, W, and 3 trains for alternate service.
The work will be done every night from Monday through Friday this week and next week.
For more information, go online to mta.info.