From 9:30 PM Friday, July 6 to 5:00 AM Monday, July 9 there will be no service in either direction at York Street in DUMBO, as F trains are being re-routed to the Q line to facilitate work on those pesky signal problems. D trains are being re-routed to the A/C line, so extra service at High Street, and will replace the F between Jay Street-MetroTech and Stillwell Avenue. N trains are being re-routed to the R in both directions all weekend, so extra service at Court Street and Jay Street.
The following work week — Monday, July 9 to Friday, July 13 — no trains will be running in either direction at Clark Street or the 2/3 platforms at Borough Hall between 9:45 PM to 11:45 PM each night Monday to Thursday. From 11:45 PM to 5:00 AM each night Monday to Friday, no 3 trains will be running, but 2 trains should be running normally, so there will be service at Clark Street and at Borough Hall.
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.