There’s lots of subway maintenance work this weekend. Post-Sandy repair work on the 4/5 tunnel connecting Brooklyn and Manhattan continues this weekend, so there will be no service in either direction on the 4/5 platforms at Borough Hall from 11:45 p.m. this Friday, January 13 and 5:00 a.m. Monday, January 16. 2, 3, and R trains will, barring unforeseen problems, provide alternative service. Also over the weekend, once again Manhattan bound F trains will be diverted to the A/C line between Jay Street and West 4th Street, which means no Manhattan bound service at York Street in DUMBO. To get to Manhattan from there, walk uphill to the High Street A/C stop. To get to the LES stops on the F, take an A, C, or F to West 4th and catch a Brooklyn bound F there.
Late nights the following work week–11:45 p.m to 5:00 a.m. each night Monday, January 16 to Friday, January 20–there will be no service in either direction at the Court Street station or the N/R platforms at Jay Street/Borough Hall. Use the 4 train, which will be running again during the week, as an option.