This weekend — Friday evening, December 14 to Monday morning, December 17 — the only disruptions to service at any local stations will be at Court Street, and from the N/R platforms at Jay Street-MetroTech. From 11:45 PM Saturday, December 15 to 6:00 AM Sunday, December 16 there will be no Manhattan bound service at either station, and all weekend — from 11:45 PM Friday to 4:00 AM Monday — there will be no late night R train service at those stations, though there will be N train service except for no Manhattan bound service Saturday night to Sunday morning. C trains will be running, but will be on a twelve minute between trains schedule.
The following work week, from Monday, December 17 to Friday, December 21, each night from 10:30 PM to 5:00 AM, there will be no 3 trains running in either direction, but 2 and 4 trains should be running normally. 2 trains will make all 3 stops between 148th Street in Manhattan and Franklin Avenue in Brooklyn, and 4 trains will make all 3 stops between Atlantic Avenue-Barclays Center and New Lots Avenue. Each night Tuesday to Friday, from 11:45 PM to 5:00 AM, there will be no Manhattan bound N trains at Court Street or from the N/R platforms at Jay Street-MetroTech. There will be Manhattan bound R service at these hours, but late night R service terminates and originates at Whitehall Street, the Manhattan station closest to Brooklyn. Since there is no W train service late at night, it won’t be possible to transfer to the W at Whitehall to go further uptown. Your best options for Manhattan bound service are the 2, 4, A, or F trains.
For planned service changes that may affect travel on other parts of the system, either during the weekend or the following week, and for unplanned disruptions, see MTA Info.